Revert "AXP PMU rewrite (again)"

This caused LCD problems on the ErosQ, where the screen would
go white until being put through a sleep/wake cycle. The exact
reason for this isn't obvious, but the problem didn't exist
prior to the AXP driver rewrite.

The two dependent changes,

42999913ba - x1000: Increase USB current limit to 500 mA at all times
90dd2f84a9 - x1000: Correctly limit USB charging current

ended up bringing the USB charging situation back to where it
was prior to the rewrite, so the cleanest option is to revert
the whole lot.

This reverts commit 42999913ba3a76221fceb04b1f935ed4e0e71476.
This reverts commit 90dd2f84a9174c38dbfb07d582ec6ee7697b1939.
This reverts commit 2d891439623bb76d38b98202ca5f3eea3c01c5f0.

Change-Id: I1cff2bfdd1b189df14bcf8cce42db725caa470d7

1 files changed, 151 insertions, 0 deletions

diff --git a/firmware/export/axp-pmu.h b/firmware/export/axp-pmu.h
new file mode 100644
index 0000000000..457f746e8c
--- /dev/null
+++ b/firmware/export/axp-pmu.h
@@ -0,0 +1,151 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2021 Aidan MacDonald
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __AXP_PMU_H__
+#define __AXP_PMU_H__
+
+#include "config.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+/* ADC channels */
+#define ADC_ACIN_VOLTAGE        0
+#define ADC_ACIN_CURRENT        1
+#define ADC_VBUS_VOLTAGE        2
+#define ADC_VBUS_CURRENT        3
+#define ADC_INTERNAL_TEMP       4
+#define ADC_TS_INPUT            5
+#define ADC_BATTERY_VOLTAGE     6
+#define ADC_CHARGE_CURRENT      7
+#define ADC_DISCHARGE_CURRENT   8
+#define ADC_APS_VOLTAGE         9
+#define ADC_BATTERY_POWER       10
+#define NUM_ADC_CHANNELS        11
+
+/* ADC sampling rates */
+#define AXP_ADC_RATE_25HZ   0
+#define AXP_ADC_RATE_50HZ   1
+#define AXP_ADC_RATE_100HZ  2
+#define AXP_ADC_RATE_200HZ  3
+
+/* Return values of axp_battery_status() */
+#define AXP_BATT_DISCHARGING    0
+#define AXP_BATT_CHARGING       1
+#define AXP_BATT_FULL           2
+
+/* Bits returned by axp_input_status() */
+#define AXP_INPUT_AC        (1 << 0)
+#define AXP_INPUT_USB       (1 << 1)
+#define AXP_INPUT_BATTERY   (1 << 2)
+#define AXP_INPUT_EXTERNAL  (AXP_INPUT_AC|AXP_INPUT_USB)
+
+/* Power supplies known by this driver. Not every chip has all supplies! */
+#define AXP_SUPPLY_DCDC1    0
+#define AXP_SUPPLY_DCDC2    1
+#define AXP_SUPPLY_DCDC3    2
+#define AXP_SUPPLY_LDO1     3
+#define AXP_SUPPLY_LDO2     4
+#define AXP_SUPPLY_LDO3     5
+#define AXP_SUPPLY_LDO_IO0  6
+#define AXP_NUM_SUPPLIES    7
+
+/* Special values returned by axp_supply_get_voltage */
+#define AXP_SUPPLY_NOT_PRESENT INT_MIN
+#define AXP_SUPPLY_DISABLED    (-1)
+
+/* Registers -- common to AXP173 and AXP192 (incomplete listing) */
+#define AXP_REG_POWERSTATUS         0x00
+#define AXP_REG_CHARGESTATUS        0x01
+#define AXP_REG_CHIP_ID             0x03
+#define AXP_REG_PWROUTPUTCTRL1      0x10
+#define AXP_REG_PWROUTPUTCTRL2      0x12
+#define AXP_REG_SHUTDOWNLEDCTRL     0x32
+#define AXP_REG_CHARGECONTROL1      0x33
+#define AXP_REG_DCDCWORKINGMODE     0x80
+#define AXP_REG_ADCENABLE1          0x82
+#define AXP_REG_ADCENABLE2          0x83
+#define AXP_REG_ADCSAMPLERATE       0x84
+#define AXP_REG_COULOMBCOUNTERBASE  0xb0
+#define AXP_REG_COULOMBCOUNTERCTRL  0xb8
+
+/* AXP192-only registers (incomplete listing) */
+#define AXP192_REG_GPIO0FUNCTION    0x90
+#define AXP192_REG_GPIO1FUNCTION    0x92
+#define AXP192_REG_GPIO2FUNCTION    0x93
+#define AXP192_REG_GPIOSTATE1       0x94
+
+/* Must be called from power_init() to initialize the driver state */
+extern void axp_init(void);
+
+/* - axp_supply_set_voltage(): set a supply voltage to the given value
+ *   in millivolts. Pass a voltage of AXP_SUPPLY_DISABLED to shut off
+ *   the supply. Any invalid supply or voltage will make the call a no-op.
+ *
+ * - axp_supply_get_voltage() returns a supply voltage in millivolts.
+ *   If the supply is powered off, returns AXP_SUPPLY_DISABLED.
+ *   If the chip does not have the supply, returns AXP_SUPPLY_NOT_PRESENT.
+ */
+extern void axp_supply_set_voltage(int supply, int voltage);
+extern int axp_supply_get_voltage(int supply);
+
+/* Basic battery and power supply status */
+extern int axp_battery_status(void);
+extern int axp_input_status(void);
+
+/* ADC access -- ADCs which are not enabled will return INT_MIN if read.
+ * The output of axp_adc_read() is normalized to appropriate units:
+ *
+ * - for voltages, the scale is millivolts
+ * - for currents, the scale is milliamps
+ * - for temperatures, the scale is tenths of a degree Celsius
+ * - for power, the scale is microwatts
+ *
+ * See the comment in axp_adc_conv_raw() for raw value precision/scale.
+ */
+extern int axp_adc_read(int adc);
+extern int axp_adc_read_raw(int adc);
+extern int axp_adc_conv_raw(int adc, int value);
+extern int axp_adc_get_enabled(void);
+extern void axp_adc_set_enabled(int adc_bits);
+extern int axp_adc_get_rate(void);
+extern void axp_adc_set_rate(int rate);
+
+/* - axp_cc_read() reads the coulomb counters
+ * - axp_cc_clear() resets both counters to zero
+ * - axp_cc_enable() will stop/start the counters running
+ * - axp_cc_is_enabled() returns true if the counters are running
+ */
+extern void axp_cc_read(uint32_t* charge, uint32_t* discharge);
+extern void axp_cc_clear(void);
+extern void axp_cc_enable(bool en);
+extern bool axp_cc_is_enabled(void);
+
+/* Set/get maximum charging current in milliamps */
+extern void axp_set_charge_current(int maxcurrent);
+extern int axp_get_charge_current(void);
+
+/* Set the shutdown bit */
+extern void axp_power_off(void);
+
+/* Debug menu */
+extern bool axp_debug_menu(void);
+
+#endif /* __AXP_PMU_H__ */