Use a single endpoint for HID reports (#3951)

* Unify multiple HID interfaces into one

This reduces the number of USB endpoints required, which frees them up
for other things.

NKRO and EXTRAKEY always use the shared endpoint.

By default, MOUSEKEY also uses it. This means it won't work as a Boot
Procotol mouse in some BIOSes, etc. If you really think your
keyboard needs to work as a mouse in your BIOS, set
MOUSE_SHARED_EP = no in your rules.mk.

By default, the core keyboard does not use the shared endpoint, as not
all BIOSes are standards compliant and that's one place you don't want
to find out your keyboard doesn't work.. If you are really confident,
you can set KEYBOARD_SHARED_EP = yes to use the shared endpoint here
too.

* unify endpoints: ChibiOS protocol implementation

* fixup: missing #ifdef EXTRAKEY_ENABLEs

broke build on AVR with EXTRAKEY disabled

* endpoints: restore error when too many endpoints required

* lufa: wait up to 10ms to send keyboard input

This avoids packets being dropped when two reports are sent in quick
succession (eg. releasing a dual role key).

* endpoints: fix compile on ARM_ATSAM

* endpoint: ARM_ATSAM fixes

No longer use wrong or unexpected endpoint IDs

* endpoints: accommodate VUSB protocol

V-USB has its own, understandably simple ideas about the report formats.
It already blasts the mouse and extrakeys through one endpoint with
report IDs. We just stay out of its way.

* endpoints: document new endpoint configuration options

* endpoints: respect keyboard_report->mods in NKRO

The caller(s) of host_keyboard_send expect to be able to just drop
modifiers in the mods field and not worry about whether NKRO is in use.
This is a good thing. So we just shift it over if needs be.

* endpoints: report.c: update for new keyboard_report format

3 files changed, 69 insertions, 20 deletions

diff --git a/tmk_core/common/host.c b/tmk_core/common/host.c
index e12b622165..f5d0416996 100644
--- a/tmk_core/common/host.c
+++ b/tmk_core/common/host.c
@@ -22,6 +22,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "util.h"
 #include "debug.h"
 
+#ifdef NKRO_ENABLE
+  #include "keycode_config.h"
+  extern keymap_config_t keymap_config;
+#endif
+
 static host_driver_t *driver;
 static uint16_t last_system_report = 0;
 static uint16_t last_consumer_report = 0;
@@ -46,6 +51,20 @@ uint8_t host_keyboard_leds(void)
 void host_keyboard_send(report_keyboard_t *report)
 {
     if (!driver) return;
+#if defined(NKRO_ENABLE) && defined(NKRO_SHARED_EP)
+    if (keyboard_protocol && keymap_config.nkro) {
+        /* The callers of this function assume that report->mods is where mods go in.
+         * But report->nkro.mods can be at a different offset if core keyboard does not have a report ID.
+         */
+        report->nkro.mods = report->mods;
+        report->nkro.report_id = REPORT_ID_NKRO;
+    } else
+#endif
+    {
+#ifdef KEYBOARD_SHARED_EP
+        report->report_id = REPORT_ID_KEYBOARD;
+#endif
+    }
     (*driver->send_keyboard)(report);
 
     if (debug_keyboard) {
@@ -60,6 +79,9 @@ void host_keyboard_send(report_keyboard_t *report)
 void host_mouse_send(report_mouse_t *report)
 {
     if (!driver) return;
+#ifdef MOUSE_SHARED_EP
+    report->report_id = REPORT_ID_MOUSE;
+#endif
     (*driver->send_mouse)(report);
 }
 
diff --git a/tmk_core/common/report.c b/tmk_core/common/report.c
index eb3b44312f..6a06b70c60 100644
--- a/tmk_core/common/report.c
+++ b/tmk_core/common/report.c
@@ -19,6 +19,7 @@
 #include "keycode_config.h"
 #include "debug.h"
 #include "util.h"
+#include <string.h>
 
 /** \brief has_anykey
  *
@@ -27,8 +28,16 @@
 uint8_t has_anykey(report_keyboard_t* keyboard_report)
 {
     uint8_t cnt = 0;
-    for (uint8_t i = 1; i < KEYBOARD_REPORT_SIZE; i++) {
-        if (keyboard_report->raw[i])
+    uint8_t *p = keyboard_report->keys;
+    uint8_t lp = sizeof(keyboard_report->keys);
+#ifdef NKRO_ENABLE
+    if (keyboard_protocol && keymap_config.nkro) {
+        p = keyboard_report->nkro.bits;
+        lp = sizeof(keyboard_report->nkro.bits);
+    }
+#endif
+    while (lp--) {
+        if (*p++)
             cnt++;
     }
     return cnt;
@@ -237,7 +246,11 @@ void del_key_from_report(report_keyboard_t* keyboard_report, uint8_t key)
 void clear_keys_from_report(report_keyboard_t* keyboard_report)
 {
     // not clear mods
-    for (int8_t i = 1; i < KEYBOARD_REPORT_SIZE; i++) {
-        keyboard_report->raw[i] = 0;
+#ifdef NKRO_ENABLE
+    if (keyboard_protocol && keymap_config.nkro) {
+        memset(keyboard_report->nkro.bits, 0, sizeof(keyboard_report->nkro.bits));
+        return;
     }
+#endif
+    memset(keyboard_report->keys, 0, sizeof(keyboard_report->keys));
 }
diff --git a/tmk_core/common/report.h b/tmk_core/common/report.h
index 167f382751..5a1a6b19c7 100644
--- a/tmk_core/common/report.h
+++ b/tmk_core/common/report.h
@@ -23,9 +23,11 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 /* report id */
-#define REPORT_ID_MOUSE     1
-#define REPORT_ID_SYSTEM    2
-#define REPORT_ID_CONSUMER  3
+#define REPORT_ID_KEYBOARD  1
+#define REPORT_ID_MOUSE     2
+#define REPORT_ID_SYSTEM    3
+#define REPORT_ID_CONSUMER  4
+#define REPORT_ID_NKRO      5
 
 /* mouse buttons */
 #define MOUSE_BTN1 (1<<0)
@@ -72,32 +74,35 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define SYSTEM_WAKE_UP          0x0083
 
 
+#define NKRO_SHARED_EP
 /* key report size(NKRO or boot mode) */
 #if defined(NKRO_ENABLE)
-  #if defined(PROTOCOL_PJRC)
-    #include "usb.h"
-    #define KEYBOARD_REPORT_SIZE KBD2_SIZE
-    #define KEYBOARD_REPORT_KEYS (KBD2_SIZE - 2)
-    #define KEYBOARD_REPORT_BITS (KBD2_SIZE - 1)
-  #elif defined(PROTOCOL_LUFA) || defined(PROTOCOL_CHIBIOS)
+  #if defined(PROTOCOL_LUFA) || defined(PROTOCOL_CHIBIOS)
     #include "protocol/usb_descriptor.h"
-    #define KEYBOARD_REPORT_SIZE NKRO_EPSIZE
-    #define KEYBOARD_REPORT_KEYS (NKRO_EPSIZE - 2)
-    #define KEYBOARD_REPORT_BITS (NKRO_EPSIZE - 1)
+    #define KEYBOARD_REPORT_BITS (SHARED_EPSIZE - 2)
   #elif defined(PROTOCOL_ARM_ATSAM)
     #include "protocol/arm_atsam/usb/udi_device_epsize.h"
-    #define KEYBOARD_REPORT_SIZE NKRO_EPSIZE
-    #define KEYBOARD_REPORT_KEYS (NKRO_EPSIZE - 2)
     #define KEYBOARD_REPORT_BITS (NKRO_EPSIZE - 1)
+    #undef NKRO_SHARED_EP
+    #undef MOUSE_SHARED_EP
   #else
     #error "NKRO not supported with this protocol"
+  #endif
 #endif
 
+#ifdef KEYBOARD_SHARED_EP
+#   define KEYBOARD_REPORT_SIZE 9
 #else
 #   define KEYBOARD_REPORT_SIZE 8
-#   define KEYBOARD_REPORT_KEYS 6
 #endif
 
+#define KEYBOARD_REPORT_KEYS 6
+
+/* VUSB hardcodes keyboard and mouse+extrakey only */
+#if defined(PROTOCOL_VUSB)
+  #undef KEYBOARD_SHARED_EP
+  #undef MOUSE_SHARED_EP
+#endif
 
 #ifdef __cplusplus
 extern "C" {
@@ -126,12 +131,18 @@ extern "C" {
 typedef union {
     uint8_t raw[KEYBOARD_REPORT_SIZE];
     struct {
+#ifdef KEYBOARD_SHARED_EP
+        uint8_t report_id;
+#endif
         uint8_t mods;
         uint8_t reserved;
         uint8_t keys[KEYBOARD_REPORT_KEYS];
     };
 #ifdef NKRO_ENABLE
-    struct {
+    struct nkro_report {
+#ifdef NKRO_SHARED_EP
+        uint8_t report_id;
+#endif
         uint8_t mods;
         uint8_t bits[KEYBOARD_REPORT_BITS];
     } nkro;
@@ -139,6 +150,9 @@ typedef union {
 } __attribute__ ((packed)) report_keyboard_t;
 
 typedef struct {
+#ifdef MOUSE_SHARED_EP
+    uint8_t report_id;
+#endif
     uint8_t buttons;
     int8_t x;
     int8_t y;