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![Pali Rohár](/assets/img/avatar_default.png)
Signed-off-by: Pali Rohár <pali.rohar@gmail.com> Acked-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Sebastian Reichel <sre@kernel.org>
1117 lines
29 KiB
C
1117 lines
29 KiB
C
/*
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* BQ27xxx battery driver
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*
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* Copyright (C) 2008 Rodolfo Giometti <giometti@linux.it>
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* Copyright (C) 2008 Eurotech S.p.A. <info@eurotech.it>
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* Copyright (C) 2010-2011 Lars-Peter Clausen <lars@metafoo.de>
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* Copyright (C) 2011 Pali Rohár <pali.rohar@gmail.com>
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*
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* Based on a previous work by Copyright (C) 2008 Texas Instruments, Inc.
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*
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* This package is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Datasheets:
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* http://www.ti.com/product/bq27000
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* http://www.ti.com/product/bq27200
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* http://www.ti.com/product/bq27010
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* http://www.ti.com/product/bq27210
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* http://www.ti.com/product/bq27500
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* http://www.ti.com/product/bq27510-g3
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* http://www.ti.com/product/bq27520-g4
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* http://www.ti.com/product/bq27530-g1
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* http://www.ti.com/product/bq27531-g1
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* http://www.ti.com/product/bq27541-g1
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* http://www.ti.com/product/bq27542-g1
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* http://www.ti.com/product/bq27546-g1
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* http://www.ti.com/product/bq27742-g1
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* http://www.ti.com/product/bq27545-g1
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* http://www.ti.com/product/bq27421-g1
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* http://www.ti.com/product/bq27425-g1
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* http://www.ti.com/product/bq27411-g1
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* http://www.ti.com/product/bq27621-g1
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/param.h>
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#include <linux/jiffies.h>
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#include <linux/workqueue.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/power_supply.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/power/bq27xxx_battery.h>
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#define DRIVER_VERSION "1.2.0"
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#define BQ27XXX_MANUFACTURER "Texas Instruments"
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/* BQ27XXX Flags */
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#define BQ27XXX_FLAG_DSC BIT(0)
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#define BQ27XXX_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
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#define BQ27XXX_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
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#define BQ27XXX_FLAG_FC BIT(9)
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#define BQ27XXX_FLAG_OTD BIT(14)
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#define BQ27XXX_FLAG_OTC BIT(15)
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#define BQ27XXX_FLAG_UT BIT(14)
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#define BQ27XXX_FLAG_OT BIT(15)
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/* BQ27000 has different layout for Flags register */
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#define BQ27000_FLAG_EDVF BIT(0) /* Final End-of-Discharge-Voltage flag */
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#define BQ27000_FLAG_EDV1 BIT(1) /* First End-of-Discharge-Voltage flag */
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#define BQ27000_FLAG_CI BIT(4) /* Capacity Inaccurate flag */
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#define BQ27000_FLAG_FC BIT(5)
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#define BQ27000_FLAG_CHGS BIT(7) /* Charge state flag */
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#define BQ27XXX_RS (20) /* Resistor sense mOhm */
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#define BQ27XXX_POWER_CONSTANT (29200) /* 29.2 µV^2 * 1000 */
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#define BQ27XXX_CURRENT_CONSTANT (3570) /* 3.57 µV * 1000 */
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#define INVALID_REG_ADDR 0xff
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/*
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* bq27xxx_reg_index - Register names
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*
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* These are indexes into a device's register mapping array.
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*/
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enum bq27xxx_reg_index {
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BQ27XXX_REG_CTRL = 0, /* Control */
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BQ27XXX_REG_TEMP, /* Temperature */
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BQ27XXX_REG_INT_TEMP, /* Internal Temperature */
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BQ27XXX_REG_VOLT, /* Voltage */
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BQ27XXX_REG_AI, /* Average Current */
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BQ27XXX_REG_FLAGS, /* Flags */
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BQ27XXX_REG_TTE, /* Time-to-Empty */
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BQ27XXX_REG_TTF, /* Time-to-Full */
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BQ27XXX_REG_TTES, /* Time-to-Empty Standby */
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BQ27XXX_REG_TTECP, /* Time-to-Empty at Constant Power */
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BQ27XXX_REG_NAC, /* Nominal Available Capacity */
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BQ27XXX_REG_FCC, /* Full Charge Capacity */
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BQ27XXX_REG_CYCT, /* Cycle Count */
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BQ27XXX_REG_AE, /* Available Energy */
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BQ27XXX_REG_SOC, /* State-of-Charge */
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BQ27XXX_REG_DCAP, /* Design Capacity */
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BQ27XXX_REG_AP, /* Average Power */
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};
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/* Register mappings */
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static u8 bq27000_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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INVALID_REG_ADDR, /* INT TEMP - NA*/
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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0x18, /* TTF */
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0x1c, /* TTES */
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0x26, /* TTECP */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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0x22, /* AE */
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0x0b, /* SOC(RSOC) */
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0x76, /* DCAP(ILMD) */
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0x24, /* AP */
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};
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static u8 bq27010_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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INVALID_REG_ADDR, /* INT TEMP - NA*/
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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0x18, /* TTF */
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0x1c, /* TTES */
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0x26, /* TTECP */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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INVALID_REG_ADDR, /* AE - NA */
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0x0b, /* SOC(RSOC) */
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0x76, /* DCAP(ILMD) */
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INVALID_REG_ADDR, /* AP - NA */
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};
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static u8 bq27500_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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0x28, /* INT TEMP */
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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INVALID_REG_ADDR, /* TTF - NA */
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0x1a, /* TTES */
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INVALID_REG_ADDR, /* TTECP - NA */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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INVALID_REG_ADDR, /* AE - NA */
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0x2c, /* SOC(RSOC) */
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0x3c, /* DCAP(ILMD) */
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INVALID_REG_ADDR, /* AP - NA */
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};
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static u8 bq27530_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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0x32, /* INT TEMP */
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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INVALID_REG_ADDR, /* TTF - NA */
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INVALID_REG_ADDR, /* TTES - NA */
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INVALID_REG_ADDR, /* TTECP - NA */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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INVALID_REG_ADDR, /* AE - NA */
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0x2c, /* SOC(RSOC) */
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INVALID_REG_ADDR, /* DCAP - NA */
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0x24, /* AP */
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};
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static u8 bq27541_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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0x28, /* INT TEMP */
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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INVALID_REG_ADDR, /* TTF - NA */
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INVALID_REG_ADDR, /* TTES - NA */
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INVALID_REG_ADDR, /* TTECP - NA */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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INVALID_REG_ADDR, /* AE - NA */
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0x2c, /* SOC(RSOC) */
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0x3c, /* DCAP */
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0x24, /* AP */
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};
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static u8 bq27545_regs[] = {
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0x00, /* CONTROL */
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0x06, /* TEMP */
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0x28, /* INT TEMP */
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0x08, /* VOLT */
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0x14, /* AVG CURR */
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0x0a, /* FLAGS */
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0x16, /* TTE */
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INVALID_REG_ADDR, /* TTF - NA */
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INVALID_REG_ADDR, /* TTES - NA */
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INVALID_REG_ADDR, /* TTECP - NA */
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0x0c, /* NAC */
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0x12, /* LMD(FCC) */
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0x2a, /* CYCT */
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INVALID_REG_ADDR, /* AE - NA */
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0x2c, /* SOC(RSOC) */
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INVALID_REG_ADDR, /* DCAP - NA */
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0x24, /* AP */
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};
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static u8 bq27421_regs[] = {
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0x00, /* CONTROL */
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0x02, /* TEMP */
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0x1e, /* INT TEMP */
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0x04, /* VOLT */
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0x10, /* AVG CURR */
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0x06, /* FLAGS */
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INVALID_REG_ADDR, /* TTE - NA */
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INVALID_REG_ADDR, /* TTF - NA */
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INVALID_REG_ADDR, /* TTES - NA */
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INVALID_REG_ADDR, /* TTECP - NA */
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0x08, /* NAC */
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0x0e, /* FCC */
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INVALID_REG_ADDR, /* CYCT - NA */
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INVALID_REG_ADDR, /* AE - NA */
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0x1c, /* SOC */
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0x3c, /* DCAP */
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0x18, /* AP */
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};
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static u8 *bq27xxx_regs[] = {
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[BQ27000] = bq27000_regs,
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[BQ27010] = bq27010_regs,
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[BQ27500] = bq27500_regs,
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[BQ27530] = bq27530_regs,
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[BQ27541] = bq27541_regs,
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[BQ27545] = bq27545_regs,
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[BQ27421] = bq27421_regs,
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};
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static enum power_supply_property bq27000_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_ENERGY_NOW,
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POWER_SUPPLY_PROP_POWER_AVG,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27010_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG,
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27500_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27530_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_POWER_AVG,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27541_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_POWER_AVG,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27545_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_HEALTH,
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POWER_SUPPLY_PROP_CYCLE_COUNT,
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POWER_SUPPLY_PROP_POWER_AVG,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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static enum power_supply_property bq27421_battery_props[] = {
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POWER_SUPPLY_PROP_STATUS,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_VOLTAGE_NOW,
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POWER_SUPPLY_PROP_CURRENT_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_CAPACITY_LEVEL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_CHARGE_FULL,
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POWER_SUPPLY_PROP_CHARGE_NOW,
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POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN,
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POWER_SUPPLY_PROP_MANUFACTURER,
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};
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#define BQ27XXX_PROP(_id, _prop) \
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[_id] = { \
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.props = _prop, \
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.size = ARRAY_SIZE(_prop), \
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}
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static struct {
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enum power_supply_property *props;
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size_t size;
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} bq27xxx_battery_props[] = {
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BQ27XXX_PROP(BQ27000, bq27000_battery_props),
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BQ27XXX_PROP(BQ27010, bq27010_battery_props),
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BQ27XXX_PROP(BQ27500, bq27500_battery_props),
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BQ27XXX_PROP(BQ27530, bq27530_battery_props),
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BQ27XXX_PROP(BQ27541, bq27541_battery_props),
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BQ27XXX_PROP(BQ27545, bq27545_battery_props),
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BQ27XXX_PROP(BQ27421, bq27421_battery_props),
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};
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static unsigned int poll_interval = 360;
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module_param(poll_interval, uint, 0644);
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MODULE_PARM_DESC(poll_interval,
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"battery poll interval in seconds - 0 disables polling");
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/*
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* Common code for BQ27xxx devices
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*/
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|
|
static inline int bq27xxx_read(struct bq27xxx_device_info *di, int reg_index,
|
|
bool single)
|
|
{
|
|
/* Reports EINVAL for invalid/missing registers */
|
|
if (!di || di->regs[reg_index] == INVALID_REG_ADDR)
|
|
return -EINVAL;
|
|
|
|
return di->bus.read(di, di->regs[reg_index], single);
|
|
}
|
|
|
|
/*
|
|
* Return the battery State-of-Charge
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_soc(struct bq27xxx_device_info *di)
|
|
{
|
|
int soc;
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
soc = bq27xxx_read(di, BQ27XXX_REG_SOC, true);
|
|
else
|
|
soc = bq27xxx_read(di, BQ27XXX_REG_SOC, false);
|
|
|
|
if (soc < 0)
|
|
dev_dbg(di->dev, "error reading State-of-Charge\n");
|
|
|
|
return soc;
|
|
}
|
|
|
|
/*
|
|
* Return a battery charge value in µAh
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_charge(struct bq27xxx_device_info *di, u8 reg)
|
|
{
|
|
int charge;
|
|
|
|
charge = bq27xxx_read(di, reg, false);
|
|
if (charge < 0) {
|
|
dev_dbg(di->dev, "error reading charge register %02x: %d\n",
|
|
reg, charge);
|
|
return charge;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
charge *= BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
|
|
else
|
|
charge *= 1000;
|
|
|
|
return charge;
|
|
}
|
|
|
|
/*
|
|
* Return the battery Nominal available capacity in µAh
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static inline int bq27xxx_battery_read_nac(struct bq27xxx_device_info *di)
|
|
{
|
|
int flags;
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010) {
|
|
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, true);
|
|
if (flags >= 0 && (flags & BQ27000_FLAG_CI))
|
|
return -ENODATA;
|
|
}
|
|
|
|
return bq27xxx_battery_read_charge(di, BQ27XXX_REG_NAC);
|
|
}
|
|
|
|
/*
|
|
* Return the battery Full Charge Capacity in µAh
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static inline int bq27xxx_battery_read_fcc(struct bq27xxx_device_info *di)
|
|
{
|
|
return bq27xxx_battery_read_charge(di, BQ27XXX_REG_FCC);
|
|
}
|
|
|
|
/*
|
|
* Return the Design Capacity in µAh
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_dcap(struct bq27xxx_device_info *di)
|
|
{
|
|
int dcap;
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, true);
|
|
else
|
|
dcap = bq27xxx_read(di, BQ27XXX_REG_DCAP, false);
|
|
|
|
if (dcap < 0) {
|
|
dev_dbg(di->dev, "error reading initial last measured discharge\n");
|
|
return dcap;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
dcap = (dcap << 8) * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
|
|
else
|
|
dcap *= 1000;
|
|
|
|
return dcap;
|
|
}
|
|
|
|
/*
|
|
* Return the battery Available energy in µWh
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_energy(struct bq27xxx_device_info *di)
|
|
{
|
|
int ae;
|
|
|
|
ae = bq27xxx_read(di, BQ27XXX_REG_AE, false);
|
|
if (ae < 0) {
|
|
dev_dbg(di->dev, "error reading available energy\n");
|
|
return ae;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
ae *= BQ27XXX_POWER_CONSTANT / BQ27XXX_RS;
|
|
else
|
|
ae *= 1000;
|
|
|
|
return ae;
|
|
}
|
|
|
|
/*
|
|
* Return the battery temperature in tenths of degree Kelvin
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_temperature(struct bq27xxx_device_info *di)
|
|
{
|
|
int temp;
|
|
|
|
temp = bq27xxx_read(di, BQ27XXX_REG_TEMP, false);
|
|
if (temp < 0) {
|
|
dev_err(di->dev, "error reading temperature\n");
|
|
return temp;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
temp = 5 * temp / 2;
|
|
|
|
return temp;
|
|
}
|
|
|
|
/*
|
|
* Return the battery Cycle count total
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_cyct(struct bq27xxx_device_info *di)
|
|
{
|
|
int cyct;
|
|
|
|
cyct = bq27xxx_read(di, BQ27XXX_REG_CYCT, false);
|
|
if (cyct < 0)
|
|
dev_err(di->dev, "error reading cycle count total\n");
|
|
|
|
return cyct;
|
|
}
|
|
|
|
/*
|
|
* Read a time register.
|
|
* Return < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_time(struct bq27xxx_device_info *di, u8 reg)
|
|
{
|
|
int tval;
|
|
|
|
tval = bq27xxx_read(di, reg, false);
|
|
if (tval < 0) {
|
|
dev_dbg(di->dev, "error reading time register %02x: %d\n",
|
|
reg, tval);
|
|
return tval;
|
|
}
|
|
|
|
if (tval == 65535)
|
|
return -ENODATA;
|
|
|
|
return tval * 60;
|
|
}
|
|
|
|
/*
|
|
* Read an average power register.
|
|
* Return < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_pwr_avg(struct bq27xxx_device_info *di)
|
|
{
|
|
int tval;
|
|
|
|
tval = bq27xxx_read(di, BQ27XXX_REG_AP, false);
|
|
if (tval < 0) {
|
|
dev_err(di->dev, "error reading average power register %02x: %d\n",
|
|
BQ27XXX_REG_AP, tval);
|
|
return tval;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
return (tval * BQ27XXX_POWER_CONSTANT) / BQ27XXX_RS;
|
|
else
|
|
return tval;
|
|
}
|
|
|
|
/*
|
|
* Returns true if a battery over temperature condition is detected
|
|
*/
|
|
static bool bq27xxx_battery_overtemp(struct bq27xxx_device_info *di, u16 flags)
|
|
{
|
|
if (di->chip == BQ27500 || di->chip == BQ27541 || di->chip == BQ27545)
|
|
return flags & (BQ27XXX_FLAG_OTC | BQ27XXX_FLAG_OTD);
|
|
if (di->chip == BQ27530 || di->chip == BQ27421)
|
|
return flags & BQ27XXX_FLAG_OT;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Returns true if a battery under temperature condition is detected
|
|
*/
|
|
static bool bq27xxx_battery_undertemp(struct bq27xxx_device_info *di, u16 flags)
|
|
{
|
|
if (di->chip == BQ27530 || di->chip == BQ27421)
|
|
return flags & BQ27XXX_FLAG_UT;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Returns true if a low state of charge condition is detected
|
|
*/
|
|
static bool bq27xxx_battery_dead(struct bq27xxx_device_info *di, u16 flags)
|
|
{
|
|
if (di->chip == BQ27000 || di->chip == BQ27010)
|
|
return flags & (BQ27000_FLAG_EDV1 | BQ27000_FLAG_EDVF);
|
|
else
|
|
return flags & (BQ27XXX_FLAG_SOC1 | BQ27XXX_FLAG_SOCF);
|
|
}
|
|
|
|
/*
|
|
* Read flag register.
|
|
* Return < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_read_health(struct bq27xxx_device_info *di)
|
|
{
|
|
int flags;
|
|
|
|
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
|
|
if (flags < 0) {
|
|
dev_err(di->dev, "error reading flag register:%d\n", flags);
|
|
return flags;
|
|
}
|
|
|
|
/* Unlikely but important to return first */
|
|
if (unlikely(bq27xxx_battery_overtemp(di, flags)))
|
|
return POWER_SUPPLY_HEALTH_OVERHEAT;
|
|
if (unlikely(bq27xxx_battery_undertemp(di, flags)))
|
|
return POWER_SUPPLY_HEALTH_COLD;
|
|
if (unlikely(bq27xxx_battery_dead(di, flags)))
|
|
return POWER_SUPPLY_HEALTH_DEAD;
|
|
|
|
return POWER_SUPPLY_HEALTH_GOOD;
|
|
}
|
|
|
|
void bq27xxx_battery_update(struct bq27xxx_device_info *di)
|
|
{
|
|
struct bq27xxx_reg_cache cache = {0, };
|
|
bool has_ci_flag = di->chip == BQ27000 || di->chip == BQ27010;
|
|
bool has_singe_flag = di->chip == BQ27000 || di->chip == BQ27010;
|
|
|
|
cache.flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, has_singe_flag);
|
|
if ((cache.flags & 0xff) == 0xff)
|
|
cache.flags = -1; /* read error */
|
|
if (cache.flags >= 0) {
|
|
cache.temperature = bq27xxx_battery_read_temperature(di);
|
|
if (has_ci_flag && (cache.flags & BQ27000_FLAG_CI)) {
|
|
dev_info_once(di->dev, "battery is not calibrated! ignoring capacity values\n");
|
|
cache.capacity = -ENODATA;
|
|
cache.energy = -ENODATA;
|
|
cache.time_to_empty = -ENODATA;
|
|
cache.time_to_empty_avg = -ENODATA;
|
|
cache.time_to_full = -ENODATA;
|
|
cache.charge_full = -ENODATA;
|
|
cache.health = -ENODATA;
|
|
} else {
|
|
if (di->regs[BQ27XXX_REG_TTE] != INVALID_REG_ADDR)
|
|
cache.time_to_empty = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTE);
|
|
if (di->regs[BQ27XXX_REG_TTECP] != INVALID_REG_ADDR)
|
|
cache.time_to_empty_avg = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTECP);
|
|
if (di->regs[BQ27XXX_REG_TTF] != INVALID_REG_ADDR)
|
|
cache.time_to_full = bq27xxx_battery_read_time(di, BQ27XXX_REG_TTF);
|
|
cache.charge_full = bq27xxx_battery_read_fcc(di);
|
|
cache.capacity = bq27xxx_battery_read_soc(di);
|
|
if (di->regs[BQ27XXX_REG_AE] != INVALID_REG_ADDR)
|
|
cache.energy = bq27xxx_battery_read_energy(di);
|
|
cache.health = bq27xxx_battery_read_health(di);
|
|
}
|
|
if (di->regs[BQ27XXX_REG_CYCT] != INVALID_REG_ADDR)
|
|
cache.cycle_count = bq27xxx_battery_read_cyct(di);
|
|
if (di->regs[BQ27XXX_REG_AP] != INVALID_REG_ADDR)
|
|
cache.power_avg = bq27xxx_battery_read_pwr_avg(di);
|
|
|
|
/* We only have to read charge design full once */
|
|
if (di->charge_design_full <= 0)
|
|
di->charge_design_full = bq27xxx_battery_read_dcap(di);
|
|
}
|
|
|
|
if (di->cache.capacity != cache.capacity)
|
|
power_supply_changed(di->bat);
|
|
|
|
if (memcmp(&di->cache, &cache, sizeof(cache)) != 0)
|
|
di->cache = cache;
|
|
|
|
di->last_update = jiffies;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bq27xxx_battery_update);
|
|
|
|
static void bq27xxx_battery_poll(struct work_struct *work)
|
|
{
|
|
struct bq27xxx_device_info *di =
|
|
container_of(work, struct bq27xxx_device_info,
|
|
work.work);
|
|
|
|
bq27xxx_battery_update(di);
|
|
|
|
if (poll_interval > 0) {
|
|
/* The timer does not have to be accurate. */
|
|
set_timer_slack(&di->work.timer, poll_interval * HZ / 4);
|
|
schedule_delayed_work(&di->work, poll_interval * HZ);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return the battery average current in µA
|
|
* Note that current can be negative signed as well
|
|
* Or 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_current(struct bq27xxx_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int curr;
|
|
int flags;
|
|
|
|
curr = bq27xxx_read(di, BQ27XXX_REG_AI, false);
|
|
if (curr < 0) {
|
|
dev_err(di->dev, "error reading current\n");
|
|
return curr;
|
|
}
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010) {
|
|
flags = bq27xxx_read(di, BQ27XXX_REG_FLAGS, false);
|
|
if (flags & BQ27000_FLAG_CHGS) {
|
|
dev_dbg(di->dev, "negative current!\n");
|
|
curr = -curr;
|
|
}
|
|
|
|
val->intval = curr * BQ27XXX_CURRENT_CONSTANT / BQ27XXX_RS;
|
|
} else {
|
|
/* Other gauges return signed value */
|
|
val->intval = (int)((s16)curr) * 1000;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27xxx_battery_status(struct bq27xxx_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int status;
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010) {
|
|
if (di->cache.flags & BQ27000_FLAG_FC)
|
|
status = POWER_SUPPLY_STATUS_FULL;
|
|
else if (di->cache.flags & BQ27000_FLAG_CHGS)
|
|
status = POWER_SUPPLY_STATUS_CHARGING;
|
|
else if (power_supply_am_i_supplied(di->bat))
|
|
status = POWER_SUPPLY_STATUS_NOT_CHARGING;
|
|
else
|
|
status = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
} else {
|
|
if (di->cache.flags & BQ27XXX_FLAG_FC)
|
|
status = POWER_SUPPLY_STATUS_FULL;
|
|
else if (di->cache.flags & BQ27XXX_FLAG_DSC)
|
|
status = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
status = POWER_SUPPLY_STATUS_CHARGING;
|
|
}
|
|
|
|
val->intval = status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27xxx_battery_capacity_level(struct bq27xxx_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int level;
|
|
|
|
if (di->chip == BQ27000 || di->chip == BQ27010) {
|
|
if (di->cache.flags & BQ27000_FLAG_FC)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
|
|
else if (di->cache.flags & BQ27000_FLAG_EDV1)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
|
|
else if (di->cache.flags & BQ27000_FLAG_EDVF)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
|
|
else
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
|
|
} else {
|
|
if (di->cache.flags & BQ27XXX_FLAG_FC)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
|
|
else if (di->cache.flags & BQ27XXX_FLAG_SOC1)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
|
|
else if (di->cache.flags & BQ27XXX_FLAG_SOCF)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
|
|
else
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
|
|
}
|
|
|
|
val->intval = level;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the battery Voltage in millivolts
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27xxx_battery_voltage(struct bq27xxx_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int volt;
|
|
|
|
volt = bq27xxx_read(di, BQ27XXX_REG_VOLT, false);
|
|
if (volt < 0) {
|
|
dev_err(di->dev, "error reading voltage\n");
|
|
return volt;
|
|
}
|
|
|
|
val->intval = volt * 1000;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27xxx_simple_value(int value,
|
|
union power_supply_propval *val)
|
|
{
|
|
if (value < 0)
|
|
return value;
|
|
|
|
val->intval = value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27xxx_battery_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret = 0;
|
|
struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
|
|
|
|
mutex_lock(&di->lock);
|
|
if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
|
|
cancel_delayed_work_sync(&di->work);
|
|
bq27xxx_battery_poll(&di->work.work);
|
|
}
|
|
mutex_unlock(&di->lock);
|
|
|
|
if (psp != POWER_SUPPLY_PROP_PRESENT && di->cache.flags < 0)
|
|
return -ENODEV;
|
|
|
|
switch (psp) {
|
|
case POWER_SUPPLY_PROP_STATUS:
|
|
ret = bq27xxx_battery_status(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
ret = bq27xxx_battery_voltage(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_PRESENT:
|
|
val->intval = di->cache.flags < 0 ? 0 : 1;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CURRENT_NOW:
|
|
ret = bq27xxx_battery_current(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
ret = bq27xxx_simple_value(di->cache.capacity, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
|
|
ret = bq27xxx_battery_capacity_level(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
ret = bq27xxx_simple_value(di->cache.temperature, val);
|
|
if (ret == 0)
|
|
val->intval -= 2731; /* convert decidegree k to c */
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
|
|
ret = bq27xxx_simple_value(di->cache.time_to_empty, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
ret = bq27xxx_simple_value(di->cache.time_to_empty_avg, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
|
|
ret = bq27xxx_simple_value(di->cache.time_to_full, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TECHNOLOGY:
|
|
val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_NOW:
|
|
ret = bq27xxx_simple_value(bq27xxx_battery_read_nac(di), val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
ret = bq27xxx_simple_value(di->cache.charge_full, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
ret = bq27xxx_simple_value(di->charge_design_full, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CYCLE_COUNT:
|
|
ret = bq27xxx_simple_value(di->cache.cycle_count, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
ret = bq27xxx_simple_value(di->cache.energy, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_POWER_AVG:
|
|
ret = bq27xxx_simple_value(di->cache.power_avg, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
ret = bq27xxx_simple_value(di->cache.health, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_MANUFACTURER:
|
|
val->strval = BQ27XXX_MANUFACTURER;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void bq27xxx_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct bq27xxx_device_info *di = power_supply_get_drvdata(psy);
|
|
|
|
cancel_delayed_work_sync(&di->work);
|
|
schedule_delayed_work(&di->work, 0);
|
|
}
|
|
|
|
int bq27xxx_battery_setup(struct bq27xxx_device_info *di)
|
|
{
|
|
struct power_supply_desc *psy_desc;
|
|
struct power_supply_config psy_cfg = { .drv_data = di, };
|
|
|
|
INIT_DELAYED_WORK(&di->work, bq27xxx_battery_poll);
|
|
mutex_init(&di->lock);
|
|
di->regs = bq27xxx_regs[di->chip];
|
|
|
|
psy_desc = devm_kzalloc(di->dev, sizeof(*psy_desc), GFP_KERNEL);
|
|
if (!psy_desc)
|
|
return -ENOMEM;
|
|
|
|
psy_desc->name = di->name;
|
|
psy_desc->type = POWER_SUPPLY_TYPE_BATTERY;
|
|
psy_desc->properties = bq27xxx_battery_props[di->chip].props;
|
|
psy_desc->num_properties = bq27xxx_battery_props[di->chip].size;
|
|
psy_desc->get_property = bq27xxx_battery_get_property;
|
|
psy_desc->external_power_changed = bq27xxx_external_power_changed;
|
|
|
|
di->bat = power_supply_register_no_ws(di->dev, psy_desc, &psy_cfg);
|
|
if (IS_ERR(di->bat)) {
|
|
dev_err(di->dev, "failed to register battery\n");
|
|
return PTR_ERR(di->bat);
|
|
}
|
|
|
|
dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
|
|
|
|
bq27xxx_battery_update(di);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(bq27xxx_battery_setup);
|
|
|
|
void bq27xxx_battery_teardown(struct bq27xxx_device_info *di)
|
|
{
|
|
/*
|
|
* power_supply_unregister call bq27xxx_battery_get_property which
|
|
* call bq27xxx_battery_poll.
|
|
* Make sure that bq27xxx_battery_poll will not call
|
|
* schedule_delayed_work again after unregister (which cause OOPS).
|
|
*/
|
|
poll_interval = 0;
|
|
|
|
cancel_delayed_work_sync(&di->work);
|
|
|
|
power_supply_unregister(di->bat);
|
|
|
|
mutex_destroy(&di->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(bq27xxx_battery_teardown);
|
|
|
|
static int bq27xxx_battery_platform_read(struct bq27xxx_device_info *di, u8 reg,
|
|
bool single)
|
|
{
|
|
struct device *dev = di->dev;
|
|
struct bq27xxx_platform_data *pdata = dev->platform_data;
|
|
unsigned int timeout = 3;
|
|
int upper, lower;
|
|
int temp;
|
|
|
|
if (!single) {
|
|
/* Make sure the value has not changed in between reading the
|
|
* lower and the upper part */
|
|
upper = pdata->read(dev, reg + 1);
|
|
do {
|
|
temp = upper;
|
|
if (upper < 0)
|
|
return upper;
|
|
|
|
lower = pdata->read(dev, reg);
|
|
if (lower < 0)
|
|
return lower;
|
|
|
|
upper = pdata->read(dev, reg + 1);
|
|
} while (temp != upper && --timeout);
|
|
|
|
if (timeout == 0)
|
|
return -EIO;
|
|
|
|
return (upper << 8) | lower;
|
|
}
|
|
|
|
return pdata->read(dev, reg);
|
|
}
|
|
|
|
static int bq27xxx_battery_platform_probe(struct platform_device *pdev)
|
|
{
|
|
struct bq27xxx_device_info *di;
|
|
struct bq27xxx_platform_data *pdata = pdev->dev.platform_data;
|
|
|
|
if (!pdata) {
|
|
dev_err(&pdev->dev, "no platform_data supplied\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!pdata->read) {
|
|
dev_err(&pdev->dev, "no hdq read callback supplied\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!pdata->chip) {
|
|
dev_err(&pdev->dev, "no device supplied\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
|
|
if (!di)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, di);
|
|
|
|
di->dev = &pdev->dev;
|
|
di->chip = pdata->chip;
|
|
di->name = pdata->name ?: dev_name(&pdev->dev);
|
|
di->bus.read = bq27xxx_battery_platform_read;
|
|
|
|
return bq27xxx_battery_setup(di);
|
|
}
|
|
|
|
static int bq27xxx_battery_platform_remove(struct platform_device *pdev)
|
|
{
|
|
struct bq27xxx_device_info *di = platform_get_drvdata(pdev);
|
|
|
|
bq27xxx_battery_teardown(di);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id bq27xxx_battery_platform_id_table[] = {
|
|
{ "bq27000-battery", },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, bq27xxx_battery_platform_id_table);
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id bq27xxx_battery_platform_of_match_table[] = {
|
|
{ .compatible = "ti,bq27000" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bq27xxx_battery_platform_of_match_table);
|
|
#endif
|
|
|
|
static struct platform_driver bq27xxx_battery_platform_driver = {
|
|
.probe = bq27xxx_battery_platform_probe,
|
|
.remove = bq27xxx_battery_platform_remove,
|
|
.driver = {
|
|
.name = "bq27000-battery",
|
|
.of_match_table = of_match_ptr(bq27xxx_battery_platform_of_match_table),
|
|
},
|
|
.id_table = bq27xxx_battery_platform_id_table,
|
|
};
|
|
module_platform_driver(bq27xxx_battery_platform_driver);
|
|
|
|
MODULE_ALIAS("platform:bq27000-battery");
|
|
|
|
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
|
|
MODULE_DESCRIPTION("BQ27xxx battery monitor driver");
|
|
MODULE_LICENSE("GPL");
|