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![Marek Belisko](/assets/img/avatar_default.png)
One an hdq buss, a missing device reads as 0xff, not -1. So do a translation to allow detecting of a missing bus. Signed-off-by: NeilBrown <neilb@suse.de> Signed-off-by: Sebastian Reichel <sre@kernel.org>
1032 lines
24 KiB
C
1032 lines
24 KiB
C
/*
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* BQ27x00 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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*/
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/*
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* Datasheets:
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* http://focus.ti.com/docs/prod/folders/print/bq27000.html
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* http://focus.ti.com/docs/prod/folders/print/bq27500.html
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* http://www.ti.com/product/bq27425-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/idr.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <asm/unaligned.h>
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#include <linux/power/bq27x00_battery.h>
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#define DRIVER_VERSION "1.2.0"
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#define BQ27x00_REG_TEMP 0x06
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#define BQ27x00_REG_VOLT 0x08
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#define BQ27x00_REG_AI 0x14
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#define BQ27x00_REG_FLAGS 0x0A
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#define BQ27x00_REG_TTE 0x16
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#define BQ27x00_REG_TTF 0x18
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#define BQ27x00_REG_TTECP 0x26
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#define BQ27x00_REG_NAC 0x0C /* Nominal available capacity */
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#define BQ27x00_REG_LMD 0x12 /* Last measured discharge */
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#define BQ27x00_REG_CYCT 0x2A /* Cycle count total */
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#define BQ27x00_REG_AE 0x22 /* Available energy */
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#define BQ27x00_POWER_AVG 0x24
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#define BQ27000_REG_RSOC 0x0B /* Relative State-of-Charge */
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#define BQ27000_REG_ILMD 0x76 /* Initial last measured discharge */
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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 BQ27500_REG_SOC 0x2C
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#define BQ27500_REG_DCAP 0x3C /* Design capacity */
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#define BQ27500_FLAG_DSC BIT(0)
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#define BQ27500_FLAG_SOCF BIT(1) /* State-of-Charge threshold final */
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#define BQ27500_FLAG_SOC1 BIT(2) /* State-of-Charge threshold 1 */
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#define BQ27500_FLAG_FC BIT(9)
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#define BQ27500_FLAG_OTC BIT(15)
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/* bq27425 register addresses are same as bq27x00 addresses minus 4 */
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#define BQ27425_REG_OFFSET 0x04
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#define BQ27425_REG_SOC 0x18 /* Register address plus offset */
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#define BQ27000_RS 20 /* Resistor sense */
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#define BQ27x00_POWER_CONSTANT (256 * 29200 / 1000)
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struct bq27x00_device_info;
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struct bq27x00_access_methods {
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int (*read)(struct bq27x00_device_info *di, u8 reg, bool single);
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};
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enum bq27x00_chip { BQ27000, BQ27500, BQ27425};
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struct bq27x00_reg_cache {
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int temperature;
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int time_to_empty;
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int time_to_empty_avg;
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int time_to_full;
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int charge_full;
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int cycle_count;
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int capacity;
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int energy;
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int flags;
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int power_avg;
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int health;
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};
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struct bq27x00_device_info {
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struct device *dev;
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int id;
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enum bq27x00_chip chip;
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struct bq27x00_reg_cache cache;
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int charge_design_full;
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unsigned long last_update;
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struct delayed_work work;
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struct power_supply bat;
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struct bq27x00_access_methods bus;
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struct mutex lock;
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};
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static enum power_supply_property bq27x00_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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};
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static enum power_supply_property bq27425_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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};
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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, "battery poll interval in seconds - " \
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"0 disables polling");
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/*
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* Common code for BQ27x00 devices
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*/
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static inline int bq27x00_read(struct bq27x00_device_info *di, u8 reg,
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bool single)
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{
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if (di->chip == BQ27425)
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return di->bus.read(di, reg - BQ27425_REG_OFFSET, single);
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return di->bus.read(di, reg, single);
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}
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/*
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* Higher versions of the chip like BQ27425 and BQ27500
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* differ from BQ27000 and BQ27200 in calculation of certain
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* parameters. Hence we need to check for the chip type.
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*/
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static bool bq27xxx_is_chip_version_higher(struct bq27x00_device_info *di)
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{
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if (di->chip == BQ27425 || di->chip == BQ27500)
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return true;
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return false;
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}
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/*
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* Return the battery Relative State-of-Charge
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_rsoc(struct bq27x00_device_info *di)
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{
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int rsoc;
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if (di->chip == BQ27500)
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rsoc = bq27x00_read(di, BQ27500_REG_SOC, false);
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else if (di->chip == BQ27425)
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rsoc = bq27x00_read(di, BQ27425_REG_SOC, false);
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else
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rsoc = bq27x00_read(di, BQ27000_REG_RSOC, true);
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if (rsoc < 0)
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dev_dbg(di->dev, "error reading relative State-of-Charge\n");
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return rsoc;
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}
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/*
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* Return a battery charge value in µAh
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_charge(struct bq27x00_device_info *di, u8 reg)
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{
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int charge;
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charge = bq27x00_read(di, reg, false);
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if (charge < 0) {
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dev_dbg(di->dev, "error reading charge register %02x: %d\n",
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reg, charge);
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return charge;
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}
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if (bq27xxx_is_chip_version_higher(di))
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charge *= 1000;
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else
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charge = charge * 3570 / BQ27000_RS;
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return charge;
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}
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/*
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* Return the battery Nominal available capaciy in µAh
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* Or < 0 if something fails.
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*/
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static inline int bq27x00_battery_read_nac(struct bq27x00_device_info *di)
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{
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int flags;
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bool is_bq27500 = di->chip == BQ27500;
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bool is_higher = bq27xxx_is_chip_version_higher(di);
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flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
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if (flags >= 0 && !is_higher && (flags & BQ27000_FLAG_CI))
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return -ENODATA;
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return bq27x00_battery_read_charge(di, BQ27x00_REG_NAC);
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}
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/*
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* Return the battery Last measured discharge in µAh
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* Or < 0 if something fails.
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*/
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static inline int bq27x00_battery_read_lmd(struct bq27x00_device_info *di)
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{
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return bq27x00_battery_read_charge(di, BQ27x00_REG_LMD);
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}
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/*
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* Return the battery Initial last measured discharge in µAh
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_ilmd(struct bq27x00_device_info *di)
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{
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int ilmd;
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if (bq27xxx_is_chip_version_higher(di))
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ilmd = bq27x00_read(di, BQ27500_REG_DCAP, false);
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else
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ilmd = bq27x00_read(di, BQ27000_REG_ILMD, true);
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if (ilmd < 0) {
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dev_dbg(di->dev, "error reading initial last measured discharge\n");
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return ilmd;
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}
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if (bq27xxx_is_chip_version_higher(di))
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ilmd *= 1000;
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else
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ilmd = ilmd * 256 * 3570 / BQ27000_RS;
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return ilmd;
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}
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/*
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* Return the battery Available energy in µWh
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_energy(struct bq27x00_device_info *di)
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{
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int ae;
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ae = bq27x00_read(di, BQ27x00_REG_AE, false);
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if (ae < 0) {
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dev_dbg(di->dev, "error reading available energy\n");
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return ae;
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}
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if (di->chip == BQ27500)
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ae *= 1000;
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else
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ae = ae * 29200 / BQ27000_RS;
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return ae;
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}
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/*
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* Return the battery temperature in tenths of degree Kelvin
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_temperature(struct bq27x00_device_info *di)
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{
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int temp;
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temp = bq27x00_read(di, BQ27x00_REG_TEMP, false);
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if (temp < 0) {
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dev_err(di->dev, "error reading temperature\n");
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return temp;
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}
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if (!bq27xxx_is_chip_version_higher(di))
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temp = 5 * temp / 2;
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return temp;
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}
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/*
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* Return the battery Cycle count total
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* Or < 0 if something fails.
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*/
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static int bq27x00_battery_read_cyct(struct bq27x00_device_info *di)
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{
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int cyct;
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cyct = bq27x00_read(di, BQ27x00_REG_CYCT, false);
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if (cyct < 0)
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dev_err(di->dev, "error reading cycle count total\n");
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return cyct;
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}
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/*
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* Read a time register.
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* Return < 0 if something fails.
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*/
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static int bq27x00_battery_read_time(struct bq27x00_device_info *di, u8 reg)
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{
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int tval;
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tval = bq27x00_read(di, reg, false);
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if (tval < 0) {
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dev_dbg(di->dev, "error reading time register %02x: %d\n",
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reg, tval);
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return tval;
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}
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if (tval == 65535)
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return -ENODATA;
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return tval * 60;
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}
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/*
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* Read a power avg register.
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* Return < 0 if something fails.
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*/
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static int bq27x00_battery_read_pwr_avg(struct bq27x00_device_info *di, u8 reg)
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{
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int tval;
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tval = bq27x00_read(di, reg, false);
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if (tval < 0) {
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dev_err(di->dev, "error reading power avg rgister %02x: %d\n",
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reg, tval);
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return tval;
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}
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if (di->chip == BQ27500)
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return tval;
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else
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return (tval * BQ27x00_POWER_CONSTANT) / BQ27000_RS;
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}
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/*
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* Read flag register.
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* Return < 0 if something fails.
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*/
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static int bq27x00_battery_read_health(struct bq27x00_device_info *di)
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{
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int tval;
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tval = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
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if (tval < 0) {
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dev_err(di->dev, "error reading flag register:%d\n", tval);
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return tval;
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}
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if ((di->chip == BQ27500)) {
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if (tval & BQ27500_FLAG_SOCF)
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tval = POWER_SUPPLY_HEALTH_DEAD;
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else if (tval & BQ27500_FLAG_OTC)
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tval = POWER_SUPPLY_HEALTH_OVERHEAT;
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else
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tval = POWER_SUPPLY_HEALTH_GOOD;
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return tval;
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} else {
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if (tval & BQ27000_FLAG_EDV1)
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tval = POWER_SUPPLY_HEALTH_DEAD;
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else
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tval = POWER_SUPPLY_HEALTH_GOOD;
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return tval;
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}
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return -1;
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}
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static void bq27x00_update(struct bq27x00_device_info *di)
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{
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struct bq27x00_reg_cache cache = {0, };
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bool is_bq27500 = di->chip == BQ27500;
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bool is_bq27425 = di->chip == BQ27425;
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cache.flags = bq27x00_read(di, BQ27x00_REG_FLAGS, !is_bq27500);
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if ((cache.flags & 0xff) == 0xff)
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/* read error */
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cache.flags = -1;
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if (cache.flags >= 0) {
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if (!is_bq27500 && !is_bq27425
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&& (cache.flags & BQ27000_FLAG_CI)) {
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dev_info(di->dev, "battery is not calibrated! ignoring capacity values\n");
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cache.capacity = -ENODATA;
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cache.energy = -ENODATA;
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cache.time_to_empty = -ENODATA;
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cache.time_to_empty_avg = -ENODATA;
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cache.time_to_full = -ENODATA;
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cache.charge_full = -ENODATA;
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cache.health = -ENODATA;
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} else {
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cache.capacity = bq27x00_battery_read_rsoc(di);
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if (!is_bq27425) {
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cache.energy = bq27x00_battery_read_energy(di);
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cache.time_to_empty =
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bq27x00_battery_read_time(di,
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BQ27x00_REG_TTE);
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cache.time_to_empty_avg =
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bq27x00_battery_read_time(di,
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BQ27x00_REG_TTECP);
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cache.time_to_full =
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bq27x00_battery_read_time(di,
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BQ27x00_REG_TTF);
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}
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cache.charge_full = bq27x00_battery_read_lmd(di);
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cache.health = bq27x00_battery_read_health(di);
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}
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cache.temperature = bq27x00_battery_read_temperature(di);
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if (!is_bq27425)
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cache.cycle_count = bq27x00_battery_read_cyct(di);
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cache.power_avg =
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bq27x00_battery_read_pwr_avg(di, BQ27x00_POWER_AVG);
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/* We only have to read charge design full once */
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if (di->charge_design_full <= 0)
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di->charge_design_full = bq27x00_battery_read_ilmd(di);
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}
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if (memcmp(&di->cache, &cache, sizeof(cache)) != 0) {
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di->cache = cache;
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power_supply_changed(&di->bat);
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}
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di->last_update = jiffies;
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}
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static void bq27x00_battery_poll(struct work_struct *work)
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{
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struct bq27x00_device_info *di =
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container_of(work, struct bq27x00_device_info, work.work);
|
|
|
|
bq27x00_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 bq27x00_battery_current(struct bq27x00_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int curr;
|
|
int flags;
|
|
|
|
curr = bq27x00_read(di, BQ27x00_REG_AI, false);
|
|
if (curr < 0) {
|
|
dev_err(di->dev, "error reading current\n");
|
|
return curr;
|
|
}
|
|
|
|
if (bq27xxx_is_chip_version_higher(di)) {
|
|
/* bq27500 returns signed value */
|
|
val->intval = (int)((s16)curr) * 1000;
|
|
} else {
|
|
flags = bq27x00_read(di, BQ27x00_REG_FLAGS, false);
|
|
if (flags & BQ27000_FLAG_CHGS) {
|
|
dev_dbg(di->dev, "negative current!\n");
|
|
curr = -curr;
|
|
}
|
|
|
|
val->intval = curr * 3570 / BQ27000_RS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27x00_battery_status(struct bq27x00_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int status;
|
|
|
|
if (bq27xxx_is_chip_version_higher(di)) {
|
|
if (di->cache.flags & BQ27500_FLAG_FC)
|
|
status = POWER_SUPPLY_STATUS_FULL;
|
|
else if (di->cache.flags & BQ27500_FLAG_DSC)
|
|
status = POWER_SUPPLY_STATUS_DISCHARGING;
|
|
else
|
|
status = POWER_SUPPLY_STATUS_CHARGING;
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
val->intval = status;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27x00_battery_capacity_level(struct bq27x00_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int level;
|
|
|
|
if (bq27xxx_is_chip_version_higher(di)) {
|
|
if (di->cache.flags & BQ27500_FLAG_FC)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_FULL;
|
|
else if (di->cache.flags & BQ27500_FLAG_SOC1)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_LOW;
|
|
else if (di->cache.flags & BQ27500_FLAG_SOCF)
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_CRITICAL;
|
|
else
|
|
level = POWER_SUPPLY_CAPACITY_LEVEL_NORMAL;
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
val->intval = level;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the battery Voltage in millivolts
|
|
* Or < 0 if something fails.
|
|
*/
|
|
static int bq27x00_battery_voltage(struct bq27x00_device_info *di,
|
|
union power_supply_propval *val)
|
|
{
|
|
int volt;
|
|
|
|
volt = bq27x00_read(di, BQ27x00_REG_VOLT, false);
|
|
if (volt < 0) {
|
|
dev_err(di->dev, "error reading voltage\n");
|
|
return volt;
|
|
}
|
|
|
|
val->intval = volt * 1000;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bq27x00_simple_value(int value,
|
|
union power_supply_propval *val)
|
|
{
|
|
if (value < 0)
|
|
return value;
|
|
|
|
val->intval = value;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define to_bq27x00_device_info(x) container_of((x), \
|
|
struct bq27x00_device_info, bat);
|
|
|
|
static int bq27x00_battery_get_property(struct power_supply *psy,
|
|
enum power_supply_property psp,
|
|
union power_supply_propval *val)
|
|
{
|
|
int ret = 0;
|
|
struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
|
|
|
|
mutex_lock(&di->lock);
|
|
if (time_is_before_jiffies(di->last_update + 5 * HZ)) {
|
|
cancel_delayed_work_sync(&di->work);
|
|
bq27x00_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 = bq27x00_battery_status(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
|
|
ret = bq27x00_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 = bq27x00_battery_current(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY:
|
|
ret = bq27x00_simple_value(di->cache.capacity, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CAPACITY_LEVEL:
|
|
ret = bq27x00_battery_capacity_level(di, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TEMP:
|
|
ret = bq27x00_simple_value(di->cache.temperature, val);
|
|
if (ret == 0)
|
|
val->intval -= 2731;
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
|
|
ret = bq27x00_simple_value(di->cache.time_to_empty, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_EMPTY_AVG:
|
|
ret = bq27x00_simple_value(di->cache.time_to_empty_avg, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
|
|
ret = bq27x00_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 = bq27x00_simple_value(bq27x00_battery_read_nac(di), val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL:
|
|
ret = bq27x00_simple_value(di->cache.charge_full, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN:
|
|
ret = bq27x00_simple_value(di->charge_design_full, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_CYCLE_COUNT:
|
|
ret = bq27x00_simple_value(di->cache.cycle_count, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_ENERGY_NOW:
|
|
ret = bq27x00_simple_value(di->cache.energy, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_POWER_AVG:
|
|
ret = bq27x00_simple_value(di->cache.power_avg, val);
|
|
break;
|
|
case POWER_SUPPLY_PROP_HEALTH:
|
|
ret = bq27x00_simple_value(di->cache.health, val);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void bq27x00_external_power_changed(struct power_supply *psy)
|
|
{
|
|
struct bq27x00_device_info *di = to_bq27x00_device_info(psy);
|
|
|
|
cancel_delayed_work_sync(&di->work);
|
|
schedule_delayed_work(&di->work, 0);
|
|
}
|
|
|
|
static int bq27x00_powersupply_init(struct bq27x00_device_info *di)
|
|
{
|
|
int ret;
|
|
|
|
di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
|
|
if (di->chip == BQ27425) {
|
|
di->bat.properties = bq27425_battery_props;
|
|
di->bat.num_properties = ARRAY_SIZE(bq27425_battery_props);
|
|
} else {
|
|
di->bat.properties = bq27x00_battery_props;
|
|
di->bat.num_properties = ARRAY_SIZE(bq27x00_battery_props);
|
|
}
|
|
di->bat.get_property = bq27x00_battery_get_property;
|
|
di->bat.external_power_changed = bq27x00_external_power_changed;
|
|
|
|
INIT_DELAYED_WORK(&di->work, bq27x00_battery_poll);
|
|
mutex_init(&di->lock);
|
|
|
|
ret = power_supply_register(di->dev, &di->bat);
|
|
if (ret) {
|
|
dev_err(di->dev, "failed to register battery: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
|
|
|
|
bq27x00_update(di);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
|
|
{
|
|
/*
|
|
* power_supply_unregister call bq27x00_battery_get_property which
|
|
* call bq27x00_battery_poll.
|
|
* Make sure that bq27x00_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);
|
|
}
|
|
|
|
|
|
/* i2c specific code */
|
|
#ifdef CONFIG_BATTERY_BQ27X00_I2C
|
|
|
|
/* If the system has several batteries we need a different name for each
|
|
* of them...
|
|
*/
|
|
static DEFINE_IDR(battery_id);
|
|
static DEFINE_MUTEX(battery_mutex);
|
|
|
|
static int bq27x00_read_i2c(struct bq27x00_device_info *di, u8 reg, bool single)
|
|
{
|
|
struct i2c_client *client = to_i2c_client(di->dev);
|
|
struct i2c_msg msg[2];
|
|
unsigned char data[2];
|
|
int ret;
|
|
|
|
if (!client->adapter)
|
|
return -ENODEV;
|
|
|
|
msg[0].addr = client->addr;
|
|
msg[0].flags = 0;
|
|
msg[0].buf = ®
|
|
msg[0].len = sizeof(reg);
|
|
msg[1].addr = client->addr;
|
|
msg[1].flags = I2C_M_RD;
|
|
msg[1].buf = data;
|
|
if (single)
|
|
msg[1].len = 1;
|
|
else
|
|
msg[1].len = 2;
|
|
|
|
ret = i2c_transfer(client->adapter, msg, ARRAY_SIZE(msg));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!single)
|
|
ret = get_unaligned_le16(data);
|
|
else
|
|
ret = data[0];
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bq27x00_battery_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
char *name;
|
|
struct bq27x00_device_info *di;
|
|
int num;
|
|
int retval = 0;
|
|
|
|
/* Get new ID for the new battery device */
|
|
mutex_lock(&battery_mutex);
|
|
num = idr_alloc(&battery_id, client, 0, 0, GFP_KERNEL);
|
|
mutex_unlock(&battery_mutex);
|
|
if (num < 0)
|
|
return num;
|
|
|
|
name = kasprintf(GFP_KERNEL, "%s-%d", id->name, num);
|
|
if (!name) {
|
|
dev_err(&client->dev, "failed to allocate device name\n");
|
|
retval = -ENOMEM;
|
|
goto batt_failed_1;
|
|
}
|
|
|
|
di = devm_kzalloc(&client->dev, sizeof(*di), GFP_KERNEL);
|
|
if (!di) {
|
|
dev_err(&client->dev, "failed to allocate device info data\n");
|
|
retval = -ENOMEM;
|
|
goto batt_failed_2;
|
|
}
|
|
|
|
di->id = num;
|
|
di->dev = &client->dev;
|
|
di->chip = id->driver_data;
|
|
di->bat.name = name;
|
|
di->bus.read = &bq27x00_read_i2c;
|
|
|
|
retval = bq27x00_powersupply_init(di);
|
|
if (retval)
|
|
goto batt_failed_2;
|
|
|
|
i2c_set_clientdata(client, di);
|
|
|
|
return 0;
|
|
|
|
batt_failed_2:
|
|
kfree(name);
|
|
batt_failed_1:
|
|
mutex_lock(&battery_mutex);
|
|
idr_remove(&battery_id, num);
|
|
mutex_unlock(&battery_mutex);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int bq27x00_battery_remove(struct i2c_client *client)
|
|
{
|
|
struct bq27x00_device_info *di = i2c_get_clientdata(client);
|
|
|
|
bq27x00_powersupply_unregister(di);
|
|
|
|
kfree(di->bat.name);
|
|
|
|
mutex_lock(&battery_mutex);
|
|
idr_remove(&battery_id, di->id);
|
|
mutex_unlock(&battery_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct i2c_device_id bq27x00_id[] = {
|
|
{ "bq27200", BQ27000 }, /* bq27200 is same as bq27000, but with i2c */
|
|
{ "bq27500", BQ27500 },
|
|
{ "bq27425", BQ27425 },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, bq27x00_id);
|
|
|
|
static struct i2c_driver bq27x00_battery_driver = {
|
|
.driver = {
|
|
.name = "bq27x00-battery",
|
|
},
|
|
.probe = bq27x00_battery_probe,
|
|
.remove = bq27x00_battery_remove,
|
|
.id_table = bq27x00_id,
|
|
};
|
|
|
|
static inline int bq27x00_battery_i2c_init(void)
|
|
{
|
|
int ret = i2c_add_driver(&bq27x00_battery_driver);
|
|
if (ret)
|
|
printk(KERN_ERR "Unable to register BQ27x00 i2c driver\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void bq27x00_battery_i2c_exit(void)
|
|
{
|
|
i2c_del_driver(&bq27x00_battery_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int bq27x00_battery_i2c_init(void) { return 0; }
|
|
static inline void bq27x00_battery_i2c_exit(void) {};
|
|
|
|
#endif
|
|
|
|
/* platform specific code */
|
|
#ifdef CONFIG_BATTERY_BQ27X00_PLATFORM
|
|
|
|
static int bq27000_read_platform(struct bq27x00_device_info *di, u8 reg,
|
|
bool single)
|
|
{
|
|
struct device *dev = di->dev;
|
|
struct bq27000_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 bq27000_battery_probe(struct platform_device *pdev)
|
|
{
|
|
struct bq27x00_device_info *di;
|
|
struct bq27000_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;
|
|
}
|
|
|
|
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
|
|
if (!di) {
|
|
dev_err(&pdev->dev, "failed to allocate device info data\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, di);
|
|
|
|
di->dev = &pdev->dev;
|
|
di->chip = BQ27000;
|
|
|
|
di->bat.name = pdata->name ?: dev_name(&pdev->dev);
|
|
di->bus.read = &bq27000_read_platform;
|
|
|
|
return bq27x00_powersupply_init(di);
|
|
}
|
|
|
|
static int bq27000_battery_remove(struct platform_device *pdev)
|
|
{
|
|
struct bq27x00_device_info *di = platform_get_drvdata(pdev);
|
|
|
|
bq27x00_powersupply_unregister(di);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver bq27000_battery_driver = {
|
|
.probe = bq27000_battery_probe,
|
|
.remove = bq27000_battery_remove,
|
|
.driver = {
|
|
.name = "bq27000-battery",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static inline int bq27x00_battery_platform_init(void)
|
|
{
|
|
int ret = platform_driver_register(&bq27000_battery_driver);
|
|
if (ret)
|
|
printk(KERN_ERR "Unable to register BQ27000 platform driver\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void bq27x00_battery_platform_exit(void)
|
|
{
|
|
platform_driver_unregister(&bq27000_battery_driver);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int bq27x00_battery_platform_init(void) { return 0; }
|
|
static inline void bq27x00_battery_platform_exit(void) {};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Module stuff
|
|
*/
|
|
|
|
static int __init bq27x00_battery_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = bq27x00_battery_i2c_init();
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = bq27x00_battery_platform_init();
|
|
if (ret)
|
|
bq27x00_battery_i2c_exit();
|
|
|
|
return ret;
|
|
}
|
|
module_init(bq27x00_battery_init);
|
|
|
|
static void __exit bq27x00_battery_exit(void)
|
|
{
|
|
bq27x00_battery_platform_exit();
|
|
bq27x00_battery_i2c_exit();
|
|
}
|
|
module_exit(bq27x00_battery_exit);
|
|
|
|
MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
|
|
MODULE_DESCRIPTION("BQ27x00 battery monitor driver");
|
|
MODULE_LICENSE("GPL");
|