taglinefilesource code
KG_ALTGR29drivers/char/kbd_kern.h#define VC_ALTGRLOCK  KG_ALTGR  /* altgr lock mode */
KG_ALTGR365include/linux/keyboard.h#define K_ALTGR    K(KT_SHIFT,KG_ALTGR)
KG_ALTGR404include/linux/keyboard.h#define K_ALTGRLOCK  K(KT_LOCK,KG_ALTGR)