rgnano: Voltage and current measure support

Battery time estimation works now.

This commit also changes the mksquashfs path to FUNKEY_SDK_PATH.

Change-Id: Ic0aa4c40011b0716f1c36c014377eaccb486e841

firmware/export/config/rgnano.h

@@ -13,7 +13,7 @@
 /* For Rolo and boot loader */
 #define MODEL_NUMBER 100
 
-#define MODEL_NAME   "RG Nano"
+#define MODEL_NAME   "Anbernic RG Nano"
 
 #ifndef SIMULATOR
 #define USB_NONE
@@ -60,12 +60,17 @@
 #define AB_REPEAT_ENABLE
 
 /* Battery stuff */
-#define CONFIG_BATTERY_MEASURE PERCENTAGE_MEASURE
+#define CONFIG_BATTERY_MEASURE (PERCENTAGE_MEASURE|VOLTAGE_MEASURE|CURRENT_MEASURE)
 #define CONFIG_CHARGING CHARGING_MONITOR
 #define HAVE_POWEROFF_WHILE_CHARGING
 #define BATTERY_DEV_NAME "axp20x-battery"
 #define POWER_DEV_NAME "axp20x-usb"
 
+#define BATTERY_CAPACITY_DEFAULT 1050 /* default battery capacity */
+#define BATTERY_CAPACITY_MIN 1050  /* min. capacity selectable */
+#define BATTERY_CAPACITY_MAX 1050 /* max. capacity selectable */
+#define BATTERY_CAPACITY_INC 0   /* capacity increment */
+
 /* Define this for LCD backlight available */
 #define BACKLIGHT_RG_NANO
 #define HAVE_BACKLIGHT

firmware/target/hosted/anbernic/power-rgnano.c

@@ -29,9 +29,32 @@
 #include "panic.h"
 #include "sysfs.h"
 
+const char * const sysfs_bat_voltage =
+    "/sys/class/power_supply/axp20x-battery/voltage_now";
+
+const char * const sysfs_bat_current =
+    "/sys/class/power_supply/axp20x-battery/current_now";
+
 const char * const sysfs_bat_level =
     "/sys/class/power_supply/axp20x-battery/capacity";
 
+unsigned int rgnano_power_get_battery_voltage(void)
+{
+    int battery_voltage;
+    sysfs_get_int(sysfs_bat_voltage, &battery_voltage);
+
+    return battery_voltage;
+}
+
+unsigned int rgnano_power_get_battery_current(void)
+{
+    int battery_current;
+    sysfs_get_int(sysfs_bat_current, &battery_current);
+
+    /* Current is in microamps */
+    return (battery_current / 1000);
+}
+
 unsigned int rgnano_power_get_battery_capacity(void)
 {
     int battery_level;

firmware/target/hosted/anbernic/power-rgnano.h

@@ -23,5 +23,7 @@
 #include <stdbool.h>
 #include "config.h"
 
+unsigned int rgnano_power_get_battery_voltage(void);
+unsigned int rgnano_power_get_battery_current(void);
 unsigned int rgnano_power_get_battery_capacity(void);
 #endif /* _POWER_RGNANO_H_ */

firmware/target/hosted/anbernic/powermgmt-rgnano.c

@@ -22,6 +22,34 @@
 #include "power.h"
 #include "power-rgnano.h"
 
+/* System handles powering off at 2% */
+unsigned short battery_level_disksafe = 0;
+unsigned short battery_level_shutoff = 0;
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
+/* read from /sys/class/power_supply/axp20x-battery/voltage_now */
+/* in 5s intervals and averaged out */
+unsigned short percent_to_volt_discharge[11] =
+{
+    3400, 3597, 3665, 3701, 3736, 3777, 3824, 3882, 3944, 4023, 4162
+};
+
+/* voltages (millivolt) of 0%, 10%, ... 100% when charging enabled */
+unsigned short percent_to_volt_charge[11] =
+{
+    3512, 3729, 3795, 3831, 3865, 3906, 3953, 4010, 4072, 4150, 4186
+};
+
+int _battery_voltage(void)
+{
+    return rgnano_power_get_battery_voltage();
+}
+
+int _battery_current(void)
+{
+    return rgnano_power_get_battery_current();
+}
+
 int _battery_level(void)
 {
     return rgnano_power_get_battery_capacity();

packaging/rgnano/rgnano.make

@@ -1,5 +1,5 @@
 RG_NANO_DIR=$(ROOTDIR)/packaging/rgnano
-MKSQUASHFS=$(dir $(CPP))mksquashfs
+MKSQUASHFS=$(FUNKEY_SDK_PATH)/bin/mksquashfs
 INSTALL_DIR=$(OPK_BUILD_DIR)/install
 OPK_BUILD_DIR=opkdir