diff options
Diffstat (limited to 'drivers/power/bq27000_battery.c')
| -rw-r--r-- | drivers/power/bq27000_battery.c | 478 |
1 files changed, 478 insertions, 0 deletions
diff --git a/drivers/power/bq27000_battery.c b/drivers/power/bq27000_battery.c new file mode 100644 index 00000000000..ff5a7eff152 --- /dev/null +++ b/drivers/power/bq27000_battery.c @@ -0,0 +1,478 @@ +/* + * Driver for batteries with bq27000 chips inside via HDQ + * + * Copyright 2008 Openmoko, Inc + * Andy Green <andy@openmoko.com> + * + * based on ds2760 driver, original copyright notice for that ---> + * + * Copyright © 2007 Anton Vorontsov + * 2004-2007 Matt Reimer + * 2004 Szabolcs Gyurko + * + * Use consistent with the GNU GPL is permitted, + * provided that this copyright notice is + * preserved in its entirety in all copies and derived works. + * + * Author: Anton Vorontsov <cbou@mail.ru> + * February 2007 + * + * Matt Reimer <mreimer@vpop.net> + * April 2004, 2005, 2007 + * + * Szabolcs Gyurko <szabolcs.gyurko@tlt.hu> + * September 2004 + */ + +#include <linux/module.h> +#include <linux/param.h> +#include <linux/jiffies.h> +#include <linux/delay.h> +#include <linux/pm.h> +#include <linux/workqueue.h> +#include <linux/platform_device.h> +#include <linux/power_supply.h> +#include <linux/bq27000_battery.h> +#include <linux/slab.h> + +enum bq27000_regs { + /* RAM regs */ + /* read-write after this */ + BQ27000_CTRL = 0, /* Device Control Register */ + BQ27000_MODE, /* Device Mode Register */ + BQ27000_AR_L, /* At-Rate H L */ + BQ27000_AR_H, + /* read-only after this */ + BQ27000_ARTTE_L, /* At-Rate Time To Empty H L */ + BQ27000_ARTTE_H, + BQ27000_TEMP_L, /* Reported Temperature H L */ + BQ27000_TEMP_H, + BQ27000_VOLT_L, /* Reported Voltage H L */ + BQ27000_VOLT_H, + BQ27000_FLAGS, /* Status Flags */ + BQ27000_RSOC, /* Relative State of Charge */ + BQ27000_NAC_L, /* Nominal Available Capacity H L */ + BQ27000_NAC_H, + BQ27000_CACD_L, /* Discharge Compensated H L */ + BQ27000_CACD_H, + BQ27000_CACT_L, /* Temperature Compensated H L */ + BQ27000_CACT_H, + BQ27000_LMD_L, /* Last measured discharge H L */ + BQ27000_LMD_H, + BQ27000_AI_L, /* Average Current H L */ + BQ27000_AI_H, + BQ27000_TTE_L, /* Time to Empty H L */ + BQ27000_TTE_H, + BQ27000_TTF_L, /* Time to Full H L */ + BQ27000_TTF_H, + BQ27000_SI_L, /* Standby Current H L */ + BQ27000_SI_H, + BQ27000_STTE_L, /* Standby Time To Empty H L */ + BQ27000_STTE_H, + BQ27000_MLI_L, /* Max Load Current H L */ + BQ27000_MLI_H, + BQ27000_MLTTE_L, /* Max Load Time To Empty H L */ + BQ27000_MLTTE_H, + BQ27000_SAE_L, /* Available Energy H L */ + BQ27000_SAE_H, + BQ27000_AP_L, /* Available Power H L */ + BQ27000_AP_H, + BQ27000_TTECP_L, /* Time to Empty at Constant Power H L */ + BQ27000_TTECP_H, + BQ27000_CYCL_L, /* Cycle count since learning cycle H L */ + BQ27000_CYCL_H, + BQ27000_CYCT_L, /* Cycle Count Total H L */ + BQ27000_CYCT_H, + BQ27000_CSOC, /* Compensated State Of Charge */ + /* EEPROM regs */ + /* read-write after this */ + BQ27000_EE_EE_EN = 0x6e, /* EEPROM Program Enable */ + BQ27000_EE_ILMD = 0x76, /* Initial Last Measured Discharge High Byte */ + BQ27000_EE_SEDVF, /* Scaled EDVF Threshold */ + BQ27000_EE_SEDV1, /* Scaled EDV1 Threshold */ + BQ27000_EE_ISLC, /* Initial Standby Load Current */ + BQ27000_EE_DMFSD, /* Digital Magnitude Filter and Self Discharge */ + BQ27000_EE_TAPER, /* Aging Estimate Enable, Charge Termination Taper */ + BQ27000_EE_PKCFG, /* Pack Configuration Values */ + BQ27000_EE_IMLC, /* Initial Max Load Current or ID #3 */ + BQ27000_EE_DCOMP, /* Discharge rate compensation constants or ID #2 */ + BQ27000_EE_TCOMP, /* Temperature Compensation constants or ID #1 */ +}; + +enum bq27000_status_flags { + BQ27000_STATUS_CHGS = 0x80, /* 1 = being charged */ + BQ27000_STATUS_NOACT = 0x40, /* 1 = no activity */ + BQ27000_STATUS_IMIN = 0x20, /* 1 = Lion taper current mode */ + BQ27000_STATUS_CI = 0x10, /* 1 = capacity likely innacurate */ + BQ27000_STATUS_CALIP = 0x08, /* 1 = calibration in progress */ + BQ27000_STATUS_VDQ = 0x04, /* 1 = capacity should be accurate */ + BQ27000_STATUS_EDV1 = 0x02, /* 1 = end of discharge.. <6% left */ + BQ27000_STATUS_EDVF = 0x01, /* 1 = no, it's really empty now */ +}; + +#define NANOVOLTS_UNIT 3750 + +struct bq27000_bat_regs { + int ai; + int flags; + int lmd; + int rsoc; + int temp; + int tte; + int ttf; + int volt; +}; + +struct bq27000_device_info { + struct device *dev; + struct power_supply bat; + struct power_supply ac; + struct power_supply usb; + struct delayed_work work; + struct bq27000_platform_data *pdata; + + struct bq27000_bat_regs regs; +}; + +static unsigned int cache_time = 5000; +module_param(cache_time, uint, 0644); +MODULE_PARM_DESC(cache_time, "cache time in milliseconds"); + +/* + * reading 16 bit values over HDQ has a special hazard where the + * hdq device firmware can update the 16-bit register during the time we + * read the two halves. TI document SLUS556D recommends the algorithm here + * to avoid trouble + */ + +static int hdq_read16(struct bq27000_device_info *di, int address) +{ + int acc; + int high; + int retries = 3; + + while (retries--) { + + high = (di->pdata->hdq_read)(address + 1); /* high part */ + + if (high < 0) + return high; + acc = (di->pdata->hdq_read)(address); + if (acc < 0) + return acc; + + /* confirm high didn't change between reading it and low */ + if (high == (di->pdata->hdq_read)(address + 1)) + return (high << 8) | acc; + } + + return -ETIME; +} + +static void bq27000_battery_external_power_changed(struct power_supply *psy) +{ + struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat); + + dev_dbg(di->dev, "%s\n", __FUNCTION__); + schedule_delayed_work(&di->work, 0); +} + +static int bq27000_battery_get_property(struct power_supply *psy, + enum power_supply_property psp, + union power_supply_propval *val) +{ + int n; + struct bq27000_device_info *di = container_of(psy, struct bq27000_device_info, bat); + + if (di->regs.rsoc < 0 && psp != POWER_SUPPLY_PROP_PRESENT) + return -ENODEV; + + switch (psp) { + case POWER_SUPPLY_PROP_STATUS: + val->intval = POWER_SUPPLY_STATUS_UNKNOWN; + + if (!di->pdata->get_charger_online_status) + goto use_bat; + if ((di->pdata->get_charger_online_status)()) { + /* + * charger is definitively present + * we report our state in terms of what it says it + * is doing + */ + if (!di->pdata->get_charger_active_status) + goto use_bat; + + if ((di->pdata->get_charger_active_status)()) { + val->intval = POWER_SUPPLY_STATUS_CHARGING; + break; + } + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + } + + /* + * platform provided definite indication of charger presence, + * and it is telling us it isn't there... but we are on so we + * must be running from battery ---> + */ + + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + break; + +use_bat: + /* + * either the charger is not connected, or the + * platform doesn't give info about charger, use battery state + * but... battery state can be out of date by 4 seconds or + * so... use the platform callbacks if possible. + */ + + /* no real activity on the battery */ + if (di->regs.ai < 2) { + if (!di->regs.ttf) + val->intval = POWER_SUPPLY_STATUS_FULL; + else + val->intval = POWER_SUPPLY_STATUS_NOT_CHARGING; + break; + } + /* power is actually going in or out... */ + if (di->regs.flags < 0) + return di->regs.flags; + if (di->regs.flags & BQ27000_STATUS_CHGS) + val->intval = POWER_SUPPLY_STATUS_CHARGING; + else + val->intval = POWER_SUPPLY_STATUS_DISCHARGING; + break; + case POWER_SUPPLY_PROP_HEALTH: + val->intval = POWER_SUPPLY_HEALTH_UNKNOWN; + /* Do we have accurate readings... */ + if (di->regs.flags < 0) + return di->regs.flags; + if (di->regs.flags & BQ27000_STATUS_VDQ) + val->intval = POWER_SUPPLY_HEALTH_GOOD; + break; + case POWER_SUPPLY_PROP_VOLTAGE_NOW: + if (di->regs.volt < 0) + return di->regs.volt; + /* mV -> uV */ + val->intval = di->regs.volt * 1000; + break; + case POWER_SUPPLY_PROP_CURRENT_NOW: + if (di->regs.flags < 0) + return di->regs.flags; + if (di->regs.flags & BQ27000_STATUS_CHGS) + n = -NANOVOLTS_UNIT; + else + n = NANOVOLTS_UNIT; + if (di->regs.ai < 0) + return di->regs.ai; + val->intval = (di->regs.ai * n) / di->pdata->rsense_mohms; + break; + case POWER_SUPPLY_PROP_CHARGE_FULL: + if (di->regs.lmd < 0) + return di->regs.lmd; + val->intval = (di->regs.lmd * 3570) / di->pdata->rsense_mohms; + break; + case POWER_SUPPLY_PROP_TEMP: + if (di->regs.temp < 0) + return di->regs.temp; + /* K (in 0.25K units) is 273.15 up from C (in 0.1C)*/ + /* 10926 = 27315 * 4 / 10 */ + val->intval = (((long)di->regs.temp * 10l) - 10926) / 4; + break; + case POWER_SUPPLY_PROP_TECHNOLOGY: + val->intval = POWER_SUPPLY_TECHNOLOGY_LION; + break; + case POWER_SUPPLY_PROP_CAPACITY: + val->intval = di->regs.rsoc; + if (val->intval < 0) + return val->intval; + break; + case POWER_SUPPLY_PROP_PRESENT: + val->intval = !(di->regs.rsoc < 0); + break; + case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: + if (di->regs.tte < 0) + return di->regs.tte; + val->intval = 60 * di->regs.tte; + break; + case POWER_SUPPLY_PROP_TIME_TO_FULL_NOW: + if (di->regs.ttf < 0) + return di->regs.ttf; + val->intval = 60 * di->regs.ttf; + break; + case POWER_SUPPLY_PROP_ONLINE: + if (di->pdata->get_charger_online_status) + val->intval = (di->pdata->get_charger_online_status)(); + else + return -EINVAL; + break; + default: + return -EINVAL; + } + + return 0; +} + +static void bq27000_battery_work(struct work_struct *work) +{ + struct bq27000_device_info *di = + container_of(work, struct bq27000_device_info, work.work); + + if ((di->pdata->hdq_initialized)()) { + struct bq27000_bat_regs regs; + + regs.ai = hdq_read16(di, BQ27000_AI_L); + regs.flags = (di->pdata->hdq_read)(BQ27000_FLAGS); + regs.lmd = hdq_read16(di, BQ27000_LMD_L); + regs.rsoc = (di->pdata->hdq_read)(BQ27000_RSOC); + regs.temp = hdq_read16(di, BQ27000_TEMP_L); + regs.tte = hdq_read16(di, BQ27000_TTE_L); + regs.ttf = hdq_read16(di, BQ27000_TTF_L); + regs.volt = hdq_read16(di, BQ27000_VOLT_L); + + if (memcmp (®s, &di->regs, sizeof(regs)) != 0) { + di->regs = regs; + power_supply_changed(&di->bat); + } + } + + if (!schedule_delayed_work(&di->work, cache_time)) + dev_err(di->dev, "battery service reschedule failed\n"); +} + +static enum power_supply_property bq27000_battery_props[] = { + POWER_SUPPLY_PROP_STATUS, + POWER_SUPPLY_PROP_HEALTH, + POWER_SUPPLY_PROP_VOLTAGE_NOW, + POWER_SUPPLY_PROP_CURRENT_NOW, + POWER_SUPPLY_PROP_CHARGE_FULL, + POWER_SUPPLY_PROP_TEMP, + POWER_SUPPLY_PROP_TECHNOLOGY, + POWER_SUPPLY_PROP_PRESENT, + POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, + POWER_SUPPLY_PROP_TIME_TO_FULL_NOW, + POWER_SUPPLY_PROP_CAPACITY, + POWER_SUPPLY_PROP_ONLINE +}; + +static int bq27000_battery_probe(struct platform_device *pdev) +{ + int retval = 0; + struct bq27000_device_info *di; + struct bq27000_platform_data *pdata; + + dev_info(&pdev->dev, "BQ27000 Battery Driver (C) 2008 Openmoko, Inc\n"); + + di = kzalloc(sizeof(*di), GFP_KERNEL); + if (!di) { + retval = -ENOMEM; + goto di_alloc_failed; + } + + platform_set_drvdata(pdev, di); + + pdata = pdev->dev.platform_data; + di->dev = &pdev->dev; + /* di->w1_dev = pdev->dev.parent; */ + di->bat.name = pdata->name; + di->bat.type = POWER_SUPPLY_TYPE_BATTERY; + di->bat.properties = bq27000_battery_props; + di->bat.num_properties = ARRAY_SIZE(bq27000_battery_props); + di->bat.get_property = bq27000_battery_get_property; + di->bat.external_power_changed = + bq27000_battery_external_power_changed; + di->bat.use_for_apm = 1; + di->pdata = pdata; + + retval = power_supply_register(&pdev->dev, &di->bat); + if (retval) { + dev_err(di->dev, "failed to register battery\n"); + goto batt_failed; + } + + INIT_DELAYED_WORK(&di->work, bq27000_battery_work); + + if (!schedule_delayed_work(&di->work, 0)) + dev_err(di->dev, "failed to schedule bq27000_battery_work\n"); + + return 0; + +batt_failed: + kfree(di); +di_alloc_failed: + return retval; +} + +static int bq27000_battery_remove(struct platform_device *pdev) +{ + struct bq27000_device_info *di = platform_get_drvdata(pdev); + + cancel_delayed_work(&di->work); + + power_supply_unregister(&di->bat); + + return 0; +} + +void bq27000_charging_state_change(struct platform_device *pdev) +{ + struct bq27000_device_info *di = platform_get_drvdata(pdev); + + if (!di) + return; +} +EXPORT_SYMBOL_GPL(bq27000_charging_state_change); + +#ifdef CONFIG_PM + +static int bq27000_battery_suspend(struct platform_device *pdev, + pm_message_t state) +{ + struct bq27000_device_info *di = platform_get_drvdata(pdev); + + cancel_delayed_work(&di->work); + return 0; +} + +static int bq27000_battery_resume(struct platform_device *pdev) +{ + struct bq27000_device_info *di = platform_get_drvdata(pdev); + + schedule_delayed_work(&di->work, 0); + return 0; +} + +#else + +#define bq27000_battery_suspend NULL +#define bq27000_battery_resume NULL + +#endif /* CONFIG_PM */ + +static struct platform_driver bq27000_battery_driver = { + .driver = { + .name = "bq27000-battery", + }, + .probe = bq27000_battery_probe, + .remove = bq27000_battery_remove, + .suspend = bq27000_battery_suspend, + .resume = bq27000_battery_resume, +}; + +static int __init bq27000_battery_init(void) +{ + return platform_driver_register(&bq27000_battery_driver); +} + +static void __exit bq27000_battery_exit(void) +{ + platform_driver_unregister(&bq27000_battery_driver); +} + +module_init(bq27000_battery_init); +module_exit(bq27000_battery_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Andy Green <andy@openmoko.com>"); +MODULE_DESCRIPTION("bq27000 battery driver"); |