rewrite everything

Source/sys-clk/sysmodule/lib/nxExt/src/max17050.c

@@ -0,0 +1,124 @@
+/*
+ * Fuel gauge driver for Nintendo Switch's Maxim 17050
+ *
+ * Copyright (c) 2011 Samsung Electronics
+ * MyungJoo Ham <myungjoo.ham@samsung.com>
+ * Copyright (c) 2018 CTCaer
+ * Copyright (c) 2022 p-sam
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include "nxExt/max17050.h"
+#include "nxExt/i2c.h"
+
+#define MAX17050_WAIT_NS 1000000000UL
+
+#define MAX17050_VCELL      0x09
+#define MAX17050_Current    0x0A
+#define MAX17050_AvgCurrent 0x0B
+#define MAX17050_AvgVCELL   0x19
+
+#define MAX17050_BOARD_CGAIN 2
+#define MAX17050_BOARD_SNS_RESISTOR_UOHM 5000
+
+static I2cSession g_i2c_session;
+static u64 g_update_ticks = 0;
+static s32 g_power_now = 0;
+static s32 g_power_avg = 0;
+
+static Result _max17050_get_power(s32 *out_mw_now, s32 *out_mw_avg)
+{
+    s64 ma, mv;
+    u16 values[3] = {0};
+
+    Result rc = i2csessionExtRegReceive(&g_i2c_session, MAX17050_VCELL, values, sizeof(values));
+
+    if (R_SUCCEEDED(rc))
+    {
+        ma = (s16)values[1];
+        ma = ma * 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
+
+        mv = (int)(values[0] >> 3) * 625 / 1000;
+
+        *out_mw_now = ma * mv / 1000000;
+    }
+
+    if (R_SUCCEEDED(rc))
+    {
+        rc = i2csessionExtRegReceive(&g_i2c_session, MAX17050_AvgVCELL, values, sizeof(u16));
+    }
+
+    if (R_SUCCEEDED(rc))
+    {
+        ma = (s16)values[2];
+        ma = ma * 1562500 / (MAX17050_BOARD_SNS_RESISTOR_UOHM * MAX17050_BOARD_CGAIN);
+
+        mv = (int)(values[0] >> 3) * 625 / 1000;
+
+        *out_mw_avg = ma * mv / 1000000;
+    }
+
+    return rc;
+}
+
+static void _max17050_update()
+{
+    u64 ticks = armGetSystemTick();
+    if(armTicksToNs(ticks - g_update_ticks) <= MAX17050_WAIT_NS)
+    {
+        return;
+    }
+
+    g_update_ticks = ticks;
+
+    if(!serviceIsActive(&g_i2c_session.s))
+    {
+        return;
+    }
+
+    _max17050_get_power(&g_power_now, &g_power_avg);
+}
+
+Result max17050Initialize(void)
+{
+    Result rc = i2cInitialize();
+
+    if(R_SUCCEEDED(rc))
+    {
+        rc = i2cOpenSession(&g_i2c_session, I2cDevice_Max17050);
+    }
+
+    return rc;
+}
+
+void max17050Exit(void)
+{
+    i2csessionClose(&g_i2c_session);
+    i2cExit();
+}
+
+s32 max17050PowerNow(void)
+{
+    _max17050_update();
+    return g_power_now;
+}
+
+s32 max17050PowerAvg(void)
+{
+    _max17050_update();
+    return g_power_avg;
+}