Add battery run protection: require charger below 10%

- Add bq24193_charger_connected() for charger detection
- Block install when battery < 10% and charger not plugged in
- Show clear screen after charger detected before continuing
- User can cancel with + and - to return to Hekate

Co-authored-by: Cursor <cursoragent@cursor.com>

bdk/power/bq24193.c

@@ -164,6 +164,12 @@ void bq24193_enable_charger()
 	i2c_send_byte(I2C_1, BQ24193_I2C_ADDR, BQ24193_PORConfig, reg);
 }
 
+bool bq24193_charger_connected()
+{
+	u8 status = bq24193_get_reg(BQ24193_Status);
+	return (status & BQ24193_STATUS_PG_MASK) != 0;
+}
+
 void bq24193_fake_battery_removal()
 {
 	// Disable watchdog to keep BATFET disabled.

bdk/power/bq24193.h

@@ -19,6 +19,8 @@
 #ifndef __BQ24193_H_
 #define __BQ24193_H_
 
+#include <utils/types.h>
+
 #define BQ24193_I2C_ADDR 0x6B
 
 // REG 0 masks.
@@ -117,5 +119,6 @@ enum BQ24193_reg_prop {
 int bq24193_get_property(enum BQ24193_reg_prop prop, int *value);
 void bq24193_enable_charger();
 void bq24193_fake_battery_removal();
+bool bq24193_charger_connected();
 
 #endif /* __BQ24193_H_ */

source/main.c

@@ -18,6 +18,8 @@
 #include <mem/heap.h>
 #include <mem/minerva.h>
 #include <power/max77620.h>
+#include <power/max17050.h>
+#include <power/bq24193.h>
 #include <soc/bpmp.h>
 #include <soc/fuse.h>
 #include <soc/hw_init.h>
@@ -376,6 +378,56 @@ void ipl_main(void) {
     // Determine installation mode
     install_mode_t mode = current.is_installed ? INSTALL_MODE_UPDATE : INSTALL_MODE_CLEAN;
     
+    // Battery run protection: below 10% requires charger
+    #define BATT_LOW_THRESHOLD 10
+    int batt_raw = 0;
+    int batt_pct = 100;
+    if (max17050_get_property(MAX17050_RepSOC, &batt_raw) == 0) {
+        batt_pct = batt_raw >> 8;  // RepSOC: high byte = percent
+    }
+    while (batt_pct < BATT_LOW_THRESHOLD && !bq24193_charger_connected()) {
+        gfx_clear_grey(0x1B);
+        gfx_con_setpos(0, 0);
+        print_header();
+        set_color(COLOR_RED);
+        gfx_printf("Akkustand zu niedrig! (%d%%)\n\n", batt_pct);
+        gfx_printf("Unter %d%% Akku darf die Installation nur\n", BATT_LOW_THRESHOLD);
+        gfx_printf("mit angeschlossenem Ladegeraet durchgefuehrt werden.\n\n");
+        set_color(COLOR_YELLOW);
+        gfx_printf("Stecke das Ladegeraet an und warte...\n");
+        gfx_printf("Oder druecke + und - zum Abbrechen.\n");
+        set_color(COLOR_WHITE);
+        jc_init_hw();
+        while (btn_read() & BTN_POWER) { msleep(50); }
+        bool user_cancelled = false;
+        while (batt_pct < BATT_LOW_THRESHOLD && !bq24193_charger_connected() && !user_cancelled) {
+            jc_gamepad_rpt_t *jc = joycon_poll();
+            if (jc && jc->plus && jc->minus) {
+                user_cancelled = true;
+                break;
+            }
+            if (max17050_get_property(MAX17050_RepSOC, &batt_raw) == 0) {
+                batt_pct = batt_raw >> 8;
+            }
+            msleep(200);
+        }
+        if (user_cancelled) {
+            gfx_printf("\nAbgebrochen. Starte Hekate...\n");
+            msleep(500);
+            if (file_exists(PAYLOAD_PATH)) {
+                launch_payload(PAYLOAD_PATH);
+            } else {
+                power_set_state(POWER_OFF_REBOOT);
+            }
+            return;
+        }
+    }
+    
+    // Charger detected or battery OK - clear the low-battery screen before continuing
+    gfx_clear_grey(0x1B);
+    gfx_con_setpos(0, 0);
+    print_header();
+    
     // Show information
     set_color(COLOR_CYAN);
     gfx_printf("Installationsmodus: %s\n", mode == INSTALL_MODE_UPDATE ? "Update" : "Saubere Installation");