nyx: Allow always writeable emmc via config

The key is `umsemmcrw` and resides in nyx.ini

README.md

@@ -67,6 +67,7 @@ You can find a template [Here](./res/hekate_ipl_template.ini)
 | timeoff=100        | Sets time offset in HEX. Must be in HOS epoch format       |
 | homescreen=0       | Sets home screen. 0: Home menu, 1: All configs (merges Launch and More configs), 2: Launch, 3: More Configs. |
 | verification=1     | 0: Disable Backup/Restore verification, 1: Sparse (block based, fast and mostly reliable), 2: Full (sha256 based, slow and 100% reliable). |
+| umsemmcrw=1        | 1: eMMC/emuMMC UMS will be mounted as writable by default. |
 
 
 ### Boot entry key/value combinations:

nyx/nyx_gui/config/config.c

@@ -60,6 +60,7 @@ void set_nyx_default_configuration()
 	n_cfg.timeoff = 0;
 	n_cfg.home_screen = 0;
 	n_cfg.verification = 1;
+	n_cfg.ums_emmc_rw = 0;
 }
 
 int create_config_entry()
@@ -202,6 +203,9 @@ int create_nyx_config_entry()
 	f_puts("\nverification=", &fp);
 	itoa(n_cfg.verification, lbuf, 10);
 	f_puts(lbuf, &fp);
+	f_puts("\numsemmcrw=", &fp);
+	itoa(n_cfg.ums_emmc_rw, lbuf, 10);
+	f_puts(lbuf, &fp);
 	f_puts("\n", &fp);
 
 	f_close(&fp);

nyx/nyx_gui/config/config.h

@@ -45,9 +45,10 @@ typedef struct _hekate_config
 typedef struct _nyx_config
 {
 	u32 themecolor;
-	s32 timeoff;
+	u32 timeoff;
 	u32 home_screen;
 	u32 verification;
+	u32 ums_emmc_rw;
 } nyx_config;
 
 void set_default_configuration();

nyx/nyx_gui/frontend/gui_tools.c

@@ -46,6 +46,7 @@
 
 extern volatile boot_cfg_t *b_cfg;
 extern hekate_config h_cfg;
+extern nyx_config n_cfg;
 
 extern void emmcsn_path_impl(char *path, char *sub_dir, char *filename, sdmmc_storage_t *storage);
 
@@ -643,8 +644,6 @@ static lv_res_t _create_window_usb_tools(lv_obj_t *parent)
 {
 	lv_obj_t *win = nyx_create_standard_window(SYMBOL_USB" USB Tools");
 
-	usb_msc_emmc_read_only = true;
-
 	static lv_style_t h_style;
 	lv_style_copy(&h_style, &lv_style_transp);
 	h_style.body.padding.inner = 0;
@@ -747,6 +746,7 @@ static lv_res_t _create_window_usb_tools(lv_obj_t *parent)
 	lv_obj_t *btn_write_access = lv_btn_create(h_write, NULL);
 	nyx_create_onoff_button(lv_theme_get_current(), h_write,
 		btn_write_access, SYMBOL_EDIT" Read-Only", _emmc_read_only_toggle, false);
+	if (!n_cfg.ums_emmc_rw)
 		lv_btn_set_state(btn_write_access, LV_BTN_STATE_TGL_REL);
 	_emmc_read_only_toggle(btn_write_access);
 

nyx/nyx_gui/nyx.c

@@ -270,6 +270,8 @@ void load_saved_configuration()
 						n_cfg.home_screen = atoi(kv->val);
 					else if (!strcmp("verification", kv->key))
 						n_cfg.verification = atoi(kv->val);
+					else if (!strcmp("umsemmcrw", kv->key))
+						n_cfg.ums_emmc_rw = atoi(kv->val) == 1;
 				}
 
 				break;