267 lines
8.3 KiB
C
267 lines
8.3 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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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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)value, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_Cycles);
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break;
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case MAX17050_MinVolt: // Voltage max/min
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_VCELL);
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*value = data * 625 / 8 / 1000;
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break;
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case MAX17050_AvgVCELL: // Voltage avg.
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)value, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_RepSOC);
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break;
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case MAX17050_DesignCap: // Charge full design.
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_DesignCap);
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data = data * 5 / 10;
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*value = data;
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break;
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case MAX17050_FullCAP: // Charge full.
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_FullCAP);
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data = data * 5 / 10;
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*value = data;
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break;
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case MAX17050_RepCap: // Charge now.
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, MAX17050_RepCap);
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data = data * 5 / 10;
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*value = data;
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break;
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case MAX17050_TEMP: // Temp.
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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&data, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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i2c_recv_buf_small((u8 *)&read_value, 2, I2C_1, MAXIM17050_I2C_ADDR, 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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