Do you know if the HDMI power control output and the hot plug detect input can work on all of the HDMI cameras or only the newer ones?
If it can also work for S100 and S110 then that would make this a more attractive option than putting in the work to get the battery 4th terminal communication working but only being able to use it on the G7X and M series cameras.
As for PTP it could possibly work as well if I used another input for syncing the shutters, though the HDMI does sound like a better idea at this point.
One other caution: The latency of the non-USB inputs has not been tested that I know of. I'd guess analog AV is likely similar to USB, since it's likely just a simple GPIO, but it requires a much trickier custom connector. HDMI stuff is potentially a lot more complicated, since my impression is the entire HDMI interface is controlled over i2c.
AF LED
Just for now I have disabled it by overwriting the result of a function that checks if the camera has had the battery replaced since last startup.
I have found many interesting functions that are called with CreateController_FW.
I could possibly copy the hook system for CreateTask in boot.c and patch CreateController_FW to create the hooks similarly
void __attribute__((naked,noinline)) task_Startup_my() { asm volatile (... " bl sub_e0425886\n" // various initilizations including for ui_malloc // ui_malloc hook " ldr r4, =0x0000cb64\n" // + " ldr r0, =ui_malloc_default_my\n" // + " str r0, [r4, #4]\n" // + " bl sub_e005b33e_my\n" // -> taskcreate_physw... );}...//0xe0371e68void __attribute__((naked,noinline)) ui_malloc_default_my() { asm volatile( // hooks first, r1 input is not used in ui_malloc_default // hook CreateController function " ldr r1, =CreateController+0x1c\n" // + function to hook + offset in fuction where lr will be (just after ui_malloc) " cmp r1, lr\n" // + check if ui_malloc has been called from the function to hook " beq CreateController_my\n" // + return immediately to alternative function //capdis -f=chdk -s=0xe0371e69 -e=0xe0371ea9 -stubs PRIMARY.BIN 0xe0000000 " push {r3, r4, r5, r6, r7, lr}\n" " mov r6, r0\n" " ldr r5, =0x0000cb64\n" " ldrb r0, [r5]\n" " lsls r0, r0, #0x1f\n" " beq loc_e0371e7e\n" " movs r2, #0x6c\n" " movs r0, #0\n" " ldr r1, =0xe0371f18\n" // *"UiMemory.c" " bl sub_dffc96f4\n" "loc_e0371e7e:\n" " ldr r0, [r5]\n" " mov r1, r6\n" " bl sub_e037e604\n" " movs r4, r0\n" " bne loc_e0371ea6\n" " ldr r0, [r5]\n" " mov r1, sp\n" " bl sub_e037e60c\n" " ldr r2, [sp]\n" " mov r1, r6\n" " ldr r0, =0xe0371f24\n" // *"Size: %ld, MaxRegion: %ld\n" " bl sub_e037e664\n" " movs r2, #0x71\n" " movs r0, #0\n" " ldr r1, =0xe0371f18\n" // *"UiMemory.c" " bl sub_dffc96f4\n" "loc_e0371ea6:\n" " mov r0, r4\n" " pop {r3, r4, r5, r6, r7, pc}\n" );}//0xe0371490void __attribute__((naked,noinline)) CreateController_my() { asm volatile( //capdis -f=chdk -s=0xe0371491 -e=0xe0371515 -stubs PRIMARY.BIN 0xe0000000// " push.w {r4, r5, r6, r7, r8, lr}\n" // - already done from original CreateController function// " mov r7, r0\n" // -// " ldr r5, =0x0000c518\n" // -// " movs r6, #0\n" // -// " mov r8, r1\n" // -// " ldrb r0, [r5]\n" // -// " lsls r0, r0, #0x1f\n" // -// " beq loc_e03714a6\n" // - // hook BattAuthController function " ldr r0, =BattAuthController\n" // + controller function to hook " cmp r0, r7\n" // + check if we are creating that controller here " it eq\n" // + EQ block " ldreq r7, =BattAuthController_my\n" // + alternate controller function to create instead// " beq loc_e03714a6\n" // + continue at ui_malloc //hook more controller functions here simmilarly " b loc_e03714a6\n" // + continue at ui_malloc (replaces beq from above) "loc_e03714a2:\n" " movs r0, #0x11\n" " b loc_e037134a\n" // return "loc_e03714a6:\n" " movs r0, #0x28\n" " bl sub_e0371f08\n" // ui_malloc " ldr r1, =0x0001d4c0\n" " mov r4, r0\n" " ldr r0, [r5]\n" " mov.w r3, #0x288\n" " ldr r2, =0xe037173c\n" // *"CtrlMan.c" " bl sub_dffca338\n" " cbz r0, loc_e03714c6\n" " mov r0, r4\n" " bl sub_e0371f0e\n" " b loc_e03714a2\n" "loc_e03714c6:\n" " ldr r0, [r5, #0xc]\n" " cbz r0, loc_e03714cc\n" " mov r6, r0\n" "loc_e03714cc:\n" " str r7, [r4]\n" " strd r8, r0, [r4, #4]\n" " movs r0, #0x19\n" " str r0, [r4, #0xc]\n" " movs r1, #0x19\n" " ldr r0, [r5, #0x14]\n" " str r0, [r4, #0x10]\n" " movs r0, #0\n" " str r0, [r4, #0x18]\n" " str r0, [r4, #0x1c]\n" " str r0, [r4, #0x20]\n" " ldr r0, [r5, #0x1c]\n" " str r0, [r4, #0x24]\n" " adds r0, r0, #1\n" " str r0, [r5, #0x1c]\n" " ldr r0, =0xe03713bd\n" " str r0, [r4, #0x14]\n" " mov r0, r4\n" " bl sub_e03713f4\n" " ldr r0, [r5]\n" " bl sub_dffcad46\n" " movs r3, #0\n" " movw r1, #0x803\n" " mov r2, r3\n" " mov r0, r4\n" " bl sub_e0371330\n" " mov r1, r4\n" " mov r0, r6\n" " bl sub_e03719b8\n" " mov r0, r4\n"// " b loc_e037134a\n" // - return (right below now rather than very far above) //capdis -f=chdk -s=0xe037134b -c=1 -stubs PRIMARY.BIN 0xe0000000 "loc_e037134a:\n" " pop.w {r4, r5, r6, r7, r8, pc}\n" );}
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