mirror of
https://github.com/CTCaer/hekate
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185526d134
BDK will allow developers to use the full collection of drivers, with limited editing, if any, for making payloads for Nintendo Switch. Using a single source for everything will also help decoupling Switch specific code and easily port it to other Tegra X1/X1+ platforms. And maybe even to lower targets. Everything is now centrilized into bdk folder. Every module or project can utilize it by simply including it. This is just the start and it will continue to improve.
280 lines
8 KiB
C
280 lines
8 KiB
C
/*
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* Fuel gauge driver for Nintendo Switch's Maxim 17050
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*
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* Copyright (c) 2011 Samsung Electronics
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* MyungJoo Ham <myungjoo.ham@samsung.com>
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* Copyright (c) 2018 CTCaer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* This driver is based on max17040_battery.c
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*/
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#include "max17050.h"
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#include "../soc/i2c.h"
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#include "../utils/util.h"
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/* Status register bits */
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#define STATUS_POR_BIT (1 << 1)
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#define STATUS_BST_BIT (1 << 3)
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#define STATUS_VMN_BIT (1 << 8)
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#define STATUS_TMN_BIT (1 << 9)
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#define STATUS_SMN_BIT (1 << 10)
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#define STATUS_BI_BIT (1 << 11)
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#define STATUS_VMX_BIT (1 << 12)
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#define STATUS_TMX_BIT (1 << 13)
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#define STATUS_SMX_BIT (1 << 14)
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#define STATUS_BR_BIT (1 << 15)
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#define VFSOC0_LOCK 0x0000
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#define VFSOC0_UNLOCK 0x0080
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#define MAX17050_VMAX_TOLERANCE 50 /* 50 mV */
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static u32 battery_voltage = 0;
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u32 max17050_get_cached_batt_volt()
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{
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return battery_voltage;
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}
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static u16 max17050_get_reg(u8 reg)
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{
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u16 data = 0;
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, reg);
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return data;
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}
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int max17050_get_property(enum MAX17050_reg reg, int *value)
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{
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u16 data;
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switch (reg)
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{
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case MAX17050_Age: // Age (percent). Based on 100% x (FullCAP Register/DesignCap).
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data = max17050_get_reg(MAX17050_Age);
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*value = data >> 8; /* Show MSB. 1% increments */
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break;
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case MAX17050_Cycles: // Cycle count.
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*value = max17050_get_reg(MAX17050_Cycles);
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break;
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case MAX17050_MinVolt: // Voltage max/min
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data = max17050_get_reg(MAX17050_MinMaxVolt);
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*value = (data & 0xff) * 20; /* Voltage MIN. Units of 20mV */
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break;
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case MAX17050_MaxVolt: // Voltage max/min
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data = max17050_get_reg(MAX17050_MinMaxVolt);
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*value = (data >> 8) * 20; /* Voltage MAX. Units of LSB = 20mV */
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break;
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case MAX17050_V_empty: // Voltage min design.
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data = max17050_get_reg(MAX17050_V_empty);
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*value = (data >> 7) * 10; /* Units of LSB = 10mV */
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break;
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case MAX17050_VCELL: // Voltage now.
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data = max17050_get_reg(MAX17050_VCELL);
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*value = data * 625 / 8 / 1000;
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battery_voltage = *value;
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break;
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case MAX17050_AvgVCELL: // Voltage avg.
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data = max17050_get_reg(MAX17050_AvgVCELL);
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*value = data * 625 / 8 / 1000;
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break;
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case MAX17050_OCVInternal: // Voltage ocv.
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data = max17050_get_reg(MAX17050_OCVInternal);
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*value = data * 625 / 8 / 1000;
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break;
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case MAX17050_RepSOC: // Capacity %.
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*value = max17050_get_reg(MAX17050_RepSOC);
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break;
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case MAX17050_DesignCap: // Charge full design.
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data = max17050_get_reg(MAX17050_DesignCap);
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*value = data * 5 / 10;
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break;
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case MAX17050_FullCAP: // Charge full.
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data = max17050_get_reg(MAX17050_FullCAP);
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*value = data * 5 / 10;
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break;
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case MAX17050_RepCap: // Charge now.
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data = max17050_get_reg(MAX17050_RepCap);
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*value = data * 5 / 10;
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break;
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case MAX17050_TEMP: // Temp.
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data = max17050_get_reg(MAX17050_TEMP);
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*value = (s16)data;
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*value = *value * 10 / 256;
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break;
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case MAX17050_Current: // Current now.
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data = max17050_get_reg(MAX17050_Current);
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*value = (s16)data;
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*value *= 1562500 / MAX17050_DEFAULT_SNS_RESISTOR;
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break;
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case MAX17050_AvgCurrent: // Current avg.
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data = max17050_get_reg(MAX17050_AvgCurrent);
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*value = (s16)data;
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*value *= 1562500 / MAX17050_DEFAULT_SNS_RESISTOR;
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break;
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default:
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return -1;
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}
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return 0;
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}
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static int _max17050_write_verify_reg(u8 reg, u16 value)
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{
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int retries = 8;
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int ret;
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u16 read_value;
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do
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{
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ret = i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, reg, (u8 *)&value, 2);
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read_value = max17050_get_reg(reg);
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if (read_value != value)
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{
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ret = -1;
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retries--;
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}
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} while (retries && read_value != value);
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return ret;
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}
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static void _max17050_override_por(u8 reg, u16 value)
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{
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if (value)
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, reg, (u8 *)&value, 2);
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}
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static void _max17050_load_new_capacity_params()
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{
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u16 fullcap, repSoc, dq_acc, dp_acc;
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fullcap = 0x2476; // 4667mAh design capacity.
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dq_acc = 0x10bc; // From a healthy fuel gauge.
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dp_acc = 0x5e09; // =||=
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repSoc = 0x6400; // 100%.
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_max17050_write_verify_reg(MAX17050_RemCap, fullcap);
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_max17050_write_verify_reg(MAX17050_RepCap, fullcap);
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_max17050_write_verify_reg(MAX17050_dQacc, dq_acc);
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_max17050_write_verify_reg(MAX17050_dPacc, dp_acc);
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_max17050_write_verify_reg(MAX17050_FullCAP, fullcap);
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//i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_DesignCap, (u8 *)&fullcap, 2);
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_max17050_write_verify_reg(MAX17050_FullCAPNom, fullcap);
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/* Update SOC register with new SOC */
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_RepSOC, (u8 *)&repSoc, 2);
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}
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static void _max17050_reset_vfsoc0_reg()
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{
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u16 lockVal = 0;
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u16 vfSoc = 0x6440; // >100% for fully charged battery
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lockVal = VFSOC0_UNLOCK;
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_VFSOC0Enable, (u8 *)&lockVal, 2);
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_max17050_write_verify_reg(MAX17050_VFSOC0, vfSoc);
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lockVal = VFSOC0_LOCK;
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_VFSOC0Enable, (u8 *)&lockVal, 2);
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}
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static void _max17050_update_capacity_regs()
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{
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u16 value = 0x2476; // Set to 4667mAh design capacity.
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_max17050_write_verify_reg(MAX17050_FullCAP, value);
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_max17050_write_verify_reg(MAX17050_FullCAPNom, value);
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//i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_DesignCap, config->design_cap, 2);
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}
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static void _max17050_write_config_regs()
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{
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u16 value = 0;
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value = 0x7254;
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_CONFIG, (u8 *)&value, 2);
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value = 0x2473;
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i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_LearnCFG, (u8 *)&value, 2);
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//i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_FilterCFG, (u8 *)&value, 2)
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//i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_RelaxCFG, (u8 *)&value, 2)
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//i2c_send_buf_small(I2C_1, MAXIM17050_I2C_ADDR, MAX17050_FullSOCThr, (u8 *)&value, 2)
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}
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/*
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* Block write all the override values coming from platform data.
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* This function MUST be called before the POR initialization proceedure
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* specified by maxim.
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*/
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static void _max17050_override_por_values()
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{
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u16 dq_acc = 0x10bc; // From a healthy fuel gauge.
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u16 dp_acc = 0x5e09; // =||=
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_max17050_override_por(MAX17050_dQacc, dq_acc);
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_max17050_override_por(MAX17050_dPacc, dp_acc);
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//_max17050_override_por(MAX17050_RCOMP0, config->rcomp0); //0x58
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//_max17050_override_por(MAX17050_TempCo, config->tcompc0); //0x1b22
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//u16 k_empty0 = 0x439;
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//_max17050_override_por(map, MAX17050_K_empty0, k_empty0); // Unknown cell data
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}
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static void _max17050_set_por_bit(u16 value)
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{
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_max17050_write_verify_reg(MAX17050_STATUS, value);
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}
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int max17050_fix_configuration()
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{
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/* Init phase, set the POR bit */
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_max17050_set_por_bit(STATUS_POR_BIT);
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/* Override POR values */
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_max17050_override_por_values();
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/* After Power up, the MAX17050 requires 500ms in order
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* to perform signal debouncing and initial SOC reporting
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*/
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msleep(500);
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/* Initialize configaration */
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_max17050_write_config_regs();
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/* update capacity params */
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_max17050_update_capacity_regs();
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/* delay must be atleast 350mS to allow VFSOC
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* to be calculated from the new configuration
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*/
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msleep(350);
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/* reset vfsoc0 reg */
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_max17050_reset_vfsoc0_reg();
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/* load new capacity params */
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_max17050_load_new_capacity_params();
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/* Init complete, Clear the POR bit */
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//_max17050_set_por_bit(0); // Should we? Or let the switch to reconfigure POR?
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// Sets POR, BI, BR.
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_max17050_set_por_bit(0x8801);
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return 0;
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}
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