478 lines
13 KiB
C
478 lines
13 KiB
C
/*
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* Driver for batteries with bq27000 chips inside via HDQ
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*
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* Copyright 2008 Openmoko, Inc
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* Andy Green <andy@openmoko.com>
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*
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* based on ds2760 driver, original copyright notice for that --->
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*
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* Copyright © 2007 Anton Vorontsov
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* 2004-2007 Matt Reimer
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* 2004 Szabolcs Gyurko
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*
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* Use consistent with the GNU GPL is permitted,
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* provided that this copyright notice is
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* preserved in its entirety in all copies and derived works.
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*
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* Author: Anton Vorontsov <cbou@mail.ru>
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* February 2007
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*
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* Matt Reimer <mreimer@vpop.net>
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* April 2004, 2005, 2007
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*
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* Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>
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* September 2004
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*/
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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/delay.h>
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#include <linux/pm.h>
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#include <linux/workqueue.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/bq27000_battery.h>
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enum bq27000_regs {
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/* RAM regs */
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/* read-write after this */
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BQ27000_CTRL = 0, /* Device Control Register */
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BQ27000_MODE, /* Device Mode Register */
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BQ27000_AR_L, /* At-Rate H L */
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BQ27000_AR_H,
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/* read-only after this */
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BQ27000_ARTTE_L, /* At-Rate Time To Empty H L */
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BQ27000_ARTTE_H,
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BQ27000_TEMP_L, /* Reported Temperature H L */
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BQ27000_TEMP_H,
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BQ27000_VOLT_L, /* Reported Voltage H L */
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BQ27000_VOLT_H,
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BQ27000_FLAGS, /* Status Flags */
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BQ27000_RSOC, /* Relative State of Charge */
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BQ27000_NAC_L, /* Nominal Available Capacity H L */
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BQ27000_NAC_H,
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BQ27000_CACD_L, /* Discharge Compensated H L */
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BQ27000_CACD_H,
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BQ27000_CACT_L, /* Temperature Compensated H L */
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BQ27000_CACT_H,
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BQ27000_LMD_L, /* Last measured discharge H L */
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BQ27000_LMD_H,
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BQ27000_AI_L, /* Average Current H L */
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BQ27000_AI_H,
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BQ27000_TTE_L, /* Time to Empty H L */
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BQ27000_TTE_H,
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BQ27000_TTF_L, /* Time to Full H L */
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BQ27000_TTF_H,
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BQ27000_SI_L, /* Standby Current H L */
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BQ27000_SI_H,
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BQ27000_STTE_L, /* Standby Time To Empty H L */
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BQ27000_STTE_H,
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BQ27000_MLI_L, /* Max Load Current H L */
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BQ27000_MLI_H,
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BQ27000_MLTTE_L, /* Max Load Time To Empty H L */
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BQ27000_MLTTE_H,
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BQ27000_SAE_L, /* Available Energy H L */
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BQ27000_SAE_H,
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BQ27000_AP_L, /* Available Power H L */
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BQ27000_AP_H,
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BQ27000_TTECP_L, /* Time to Empty at Constant Power H L */
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BQ27000_TTECP_H,
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BQ27000_CYCL_L, /* Cycle count since learning cycle H L */
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BQ27000_CYCL_H,
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BQ27000_CYCT_L, /* Cycle Count Total H L */
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BQ27000_CYCT_H,
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BQ27000_CSOC, /* Compensated State Of Charge */
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/* EEPROM regs */
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/* read-write after this */
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BQ27000_EE_EE_EN = 0x6e, /* EEPROM Program Enable */
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BQ27000_EE_ILMD = 0x76, /* Initial Last Measured Discharge High Byte */
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BQ27000_EE_SEDVF, /* Scaled EDVF Threshold */
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BQ27000_EE_SEDV1, /* Scaled EDV1 Threshold */
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BQ27000_EE_ISLC, /* Initial Standby Load Current */
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BQ27000_EE_DMFSD, /* Digital Magnitude Filter and Self Discharge */
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BQ27000_EE_TAPER, /* Aging Estimate Enable, Charge Termination Taper */
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BQ27000_EE_PKCFG, /* Pack Configuration Values */
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BQ27000_EE_IMLC, /* Initial Max Load Current or ID #3 */
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BQ27000_EE_DCOMP, /* Discharge rate compensation constants or ID #2 */
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BQ27000_EE_TCOMP, /* Temperature Compensation constants or ID #1 */
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};
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enum bq27000_status_flags {
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BQ27000_STATUS_CHGS = 0x80, /* 1 = being charged */
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BQ27000_STATUS_NOACT = 0x40, /* 1 = no activity */
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BQ27000_STATUS_IMIN = 0x20, /* 1 = Lion taper current mode */
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BQ27000_STATUS_CI = 0x10, /* 1 = capacity likely innacurate */
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BQ27000_STATUS_CALIP = 0x08, /* 1 = calibration in progress */
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BQ27000_STATUS_VDQ = 0x04, /* 1 = capacity should be accurate */
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BQ27000_STATUS_EDV1 = 0x02, /* 1 = end of discharge.. <6% left */
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BQ27000_STATUS_EDVF = 0x01, /* 1 = no, it's really empty now */
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};
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#define NANOVOLTS_UNIT 3750
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struct bq27000_bat_regs {
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int ai;
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int flags;
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int lmd;
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int rsoc;
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int temp;
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int tte;
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int ttf;
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int volt;
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};
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struct bq27000_device_info {
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struct device *dev;
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struct power_supply bat;
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struct power_supply ac;
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struct power_supply usb;
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struct delayed_work work;
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struct bq27000_platform_data *pdata;
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struct bq27000_bat_regs regs;
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};
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static unsigned int cache_time = 5000;
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module_param(cache_time, uint, 0644);
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MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
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/*
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* reading 16 bit values over HDQ has a special hazard where the
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* hdq device firmware can update the 16-bit register during the time we
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* read the two halves. TI document SLUS556D recommends the algorithm here
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* to avoid trouble
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*/
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static int hdq_read16(struct bq27000_device_info *di, int address)
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{
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int acc;
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int high;
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int retries = 3;
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while (retries--) {
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high = (di->pdata->hdq_read)(address + 1); /* high part */
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if (high < 0)
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return high;
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acc = (di->pdata->hdq_read)(address);
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if (acc < 0)
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return acc;
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/* confirm high didn't change between reading it and low */
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if (high == (di->pdata->hdq_read)(address + 1))
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return (high << 8) | acc;
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}
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return -ETIME;
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}
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static void bq27000_battery_external_power_changed(struct power_supply *psy)
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{
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struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
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dev_dbg(di->dev, "%s\n", __FUNCTION__);
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schedule_delayed_work(&di->work, 0);
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}
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static int bq27000_battery_get_property(struct power_supply *psy,
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enum power_supply_property psp,
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union power_supply_propval *val)
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{
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int n;
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struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat);
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if (di->regs.rsoc < 0 && psp != POWER_SUPPLY_PROP_PRESENT)
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return -ENODEV;
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switch (psp) {
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case POWER_SUPPLY_PROP_STATUS:
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val->intval = POWER_SUPPLY_STATUS_UNKNOWN;
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if (!di->pdata->get_charger_online_status)
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goto use_bat;
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if ((di->pdata->get_charger_online_status)()) {
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/*
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* charger is definitively present
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* we report our state in terms of what it says it
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* is doing
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*/
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if (!di->pdata->get_charger_active_status)
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goto use_bat;
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if ((di->pdata->get_charger_active_status)()) {
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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break;
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}
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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}
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/*
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* platform provided definite indication of charger presence,
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* and it is telling us it isn't there... but we are on so we
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* must be running from battery --->
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*/
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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use_bat:
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/*
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* either the charger is not connected, or the
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* platform doesn't give info about charger, use battery state
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* but... battery state can be out of date by 4 seconds or
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* so... use the platform callbacks if possible.
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*/
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/* no real activity on the battery */
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if (di->regs.ai < 2) {
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if (!di->regs.ttf)
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val->intval = POWER_SUPPLY_STATUS_FULL;
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else
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val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING;
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break;
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}
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/* power is actually going in or out... */
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if (di->regs.flags < 0)
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return di->regs.flags;
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if (di->regs.flags & BQ27000_STATUS_CHGS)
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val->intval = POWER_SUPPLY_STATUS_CHARGING;
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else
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val->intval = POWER_SUPPLY_STATUS_DISCHARGING;
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break;
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case POWER_SUPPLY_PROP_HEALTH:
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val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
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/* Do we have accurate readings... */
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if (di->regs.flags < 0)
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return di->regs.flags;
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if (di->regs.flags & BQ27000_STATUS_VDQ)
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val->intval = POWER_SUPPLY_HEALTH_GOOD;
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break;
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case POWER_SUPPLY_PROP_VOLTAGE_NOW:
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if (di->regs.volt < 0)
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return di->regs.volt;
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/* mV -> uV */
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val->intval = di->regs.volt * 1000;
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break;
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case POWER_SUPPLY_PROP_CURRENT_NOW:
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if (di->regs.flags < 0)
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return di->regs.flags;
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if (di->regs.flags & BQ27000_STATUS_CHGS)
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n = -NANOVOLTS_UNIT;
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else
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n = NANOVOLTS_UNIT;
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if (di->regs.ai < 0)
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return di->regs.ai;
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val->intval = (di->regs.ai * n) / di->pdata->rsense_mohms;
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break;
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case POWER_SUPPLY_PROP_CHARGE_FULL:
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if (di->regs.lmd < 0)
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return di->regs.lmd;
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val->intval = (di->regs.lmd * 3570) / di->pdata->rsense_mohms;
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break;
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case POWER_SUPPLY_PROP_TEMP:
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if (di->regs.temp < 0)
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return di->regs.temp;
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/* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/
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/* 10926 = 27315 * 4 / 10 */
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val->intval = (((long)di->regs.temp * 10l) - 10926) / 4;
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break;
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case POWER_SUPPLY_PROP_TECHNOLOGY:
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val->intval = POWER_SUPPLY_TECHNOLOGY_LION;
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break;
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case POWER_SUPPLY_PROP_CAPACITY:
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val->intval = di->regs.rsoc;
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if (val->intval < 0)
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return val->intval;
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break;
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case POWER_SUPPLY_PROP_PRESENT:
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val->intval = !(di->regs.rsoc < 0);
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break;
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case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW:
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if (di->regs.tte < 0)
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return di->regs.tte;
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val->intval = 60 * di->regs.tte;
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break;
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case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW:
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if (di->regs.ttf < 0)
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return di->regs.ttf;
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val->intval = 60 * di->regs.ttf;
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break;
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case POWER_SUPPLY_PROP_ONLINE:
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if (di->pdata->get_charger_online_status)
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val->intval = (di->pdata->get_charger_online_status)();
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else
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static void bq27000_battery_work(struct work_struct *work)
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{
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struct bq27000_device_info *di =
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container_of(work, struct bq27000_device_info, work.work);
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if ((di->pdata->hdq_initialized)()) {
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struct bq27000_bat_regs regs;
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regs.ai = hdq_read16(di, BQ27000_AI_L);
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regs.flags = (di->pdata->hdq_read)(BQ27000_FLAGS);
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regs.lmd = hdq_read16(di, BQ27000_LMD_L);
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regs.rsoc = (di->pdata->hdq_read)(BQ27000_RSOC);
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regs.temp = hdq_read16(di, BQ27000_TEMP_L);
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regs.tte = hdq_read16(di, BQ27000_TTE_L);
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regs.ttf = hdq_read16(di, BQ27000_TTF_L);
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regs.volt = hdq_read16(di, BQ27000_VOLT_L);
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if (memcmp (®s, &di->regs, sizeof(regs)) != 0) {
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di->regs = regs;
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power_supply_changed(&di->bat);
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}
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}
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if (!schedule_delayed_work(&di->work, cache_time))
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dev_err(di->dev, "battery service reschedule failed\n");
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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_HEALTH,
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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_CHARGE_FULL,
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POWER_SUPPLY_PROP_TEMP,
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POWER_SUPPLY_PROP_TECHNOLOGY,
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POWER_SUPPLY_PROP_PRESENT,
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POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW,
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POWER_SUPPLY_PROP_TIME_TO_FULL_NOW,
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POWER_SUPPLY_PROP_CAPACITY,
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POWER_SUPPLY_PROP_ONLINE
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};
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static int bq27000_battery_probe(struct platform_device *pdev)
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{
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int retval = 0;
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struct bq27000_device_info *di;
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struct bq27000_platform_data *pdata;
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dev_info(&pdev->dev, "BQ27000 Battery Driver (C) 2008 Openmoko, Inc\n");
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di = kzalloc(sizeof(*di), GFP_KERNEL);
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if (!di) {
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retval = -ENOMEM;
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goto di_alloc_failed;
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}
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platform_set_drvdata(pdev, di);
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pdata = pdev->dev.platform_data;
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di->dev = &pdev->dev;
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/* di->w1_dev = pdev->dev.parent; */
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di->bat.name = pdata->name;
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di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
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di->bat.properties = bq27000_battery_props;
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di->bat.num_properties = ARRAY_SIZE(bq27000_battery_props);
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di->bat.get_property = bq27000_battery_get_property;
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di->bat.external_power_changed =
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bq27000_battery_external_power_changed;
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di->bat.use_for_apm = 1;
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di->pdata = pdata;
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retval = power_supply_register(&pdev->dev, &di->bat);
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if (retval) {
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dev_err(di->dev, "failed to register battery\n");
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goto batt_failed;
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}
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INIT_DELAYED_WORK(&di->work, bq27000_battery_work);
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if (!schedule_delayed_work(&di->work, 0))
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dev_err(di->dev, "failed to schedule bq27000_battery_work\n");
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return 0;
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batt_failed:
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kfree(di);
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di_alloc_failed:
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return retval;
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}
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static int bq27000_battery_remove(struct platform_device *pdev)
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{
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struct bq27000_device_info *di = platform_get_drvdata(pdev);
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cancel_delayed_work(&di->work);
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power_supply_unregister(&di->bat);
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return 0;
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}
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void bq27000_charging_state_change(struct platform_device *pdev)
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{
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struct bq27000_device_info *di = platform_get_drvdata(pdev);
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if (!di)
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return;
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}
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EXPORT_SYMBOL_GPL(bq27000_charging_state_change);
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#ifdef CONFIG_PM
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static int bq27000_battery_suspend(struct platform_device *pdev,
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pm_message_t state)
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{
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struct bq27000_device_info *di = platform_get_drvdata(pdev);
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cancel_delayed_work(&di->work);
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return 0;
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}
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static int bq27000_battery_resume(struct platform_device *pdev)
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{
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struct bq27000_device_info *di = platform_get_drvdata(pdev);
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schedule_delayed_work(&di->work, 0);
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return 0;
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}
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#else
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#define bq27000_battery_suspend NULL
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#define bq27000_battery_resume NULL
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#endif /* CONFIG_PM */
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static struct platform_driver bq27000_battery_driver = {
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.driver = {
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.name = "bq27000-battery",
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},
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.probe = bq27000_battery_probe,
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.remove = bq27000_battery_remove,
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.suspend = bq27000_battery_suspend,
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.resume = bq27000_battery_resume,
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};
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static int __init bq27000_battery_init(void)
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{
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return platform_driver_register(&bq27000_battery_driver);
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}
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static void __exit bq27000_battery_exit(void)
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{
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platform_driver_unregister(&bq27000_battery_driver);
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}
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module_init(bq27000_battery_init);
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module_exit(bq27000_battery_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Andy Green <andy@openmoko.com>");
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MODULE_DESCRIPTION("bq27000 battery driver");
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