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Release 4.14 drivers/power/supply/ds2760_battery.c

/*
 * Driver for batteries with DS2760 chips inside.
 *
 * 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/workqueue.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>

#include <linux/w1.h>
#include "../../w1/slaves/w1_ds2760.h"


struct ds2760_device_info {
	
struct device *dev;

	/* DS2760 data, valid after calling ds2760_battery_read_status() */
	
unsigned long update_time;	/* jiffies when data read */
	
char raw[DS2760_DATA_SIZE];	/* raw DS2760 data */
	
int voltage_raw;		/* units of 4.88 mV */
	
int voltage_uV;			/* units of µV */
	
int current_raw;		/* units of 0.625 mA */
	
int current_uA;			/* units of µA */
	
int accum_current_raw;		/* units of 0.25 mAh */
	
int accum_current_uAh;		/* units of µAh */
	
int temp_raw;			/* units of 0.125 °C */
	
int temp_C;			/* units of 0.1 °C */
	
int rated_capacity;		/* units of µAh */
	
int rem_capacity;		/* percentage */
	
int full_active_uAh;		/* units of µAh */
	
int empty_uAh;			/* units of µAh */
	
int life_sec;			/* units of seconds */
	
int charge_status;		/* POWER_SUPPLY_STATUS_* */

	
int full_counter;
	
struct power_supply *bat;
	
struct power_supply_desc bat_desc;
	
struct device *w1_dev;
	
struct workqueue_struct *monitor_wqueue;
	
struct delayed_work monitor_work;
	
struct delayed_work set_charged_work;
};


static unsigned int cache_time = 1000;
module_param(cache_time, uint, 0644);
MODULE_PARM_DESC(cache_time, "cache time in milliseconds");


static bool pmod_enabled;
module_param(pmod_enabled, bool, 0644);
MODULE_PARM_DESC(pmod_enabled, "PMOD enable bit");


static unsigned int rated_capacity;
module_param(rated_capacity, uint, 0644);
MODULE_PARM_DESC(rated_capacity, "rated battery capacity, 10*mAh or index");


static unsigned int current_accum;
module_param(current_accum, uint, 0644);
MODULE_PARM_DESC(current_accum, "current accumulator value");

/* Some batteries have their rated capacity stored a N * 10 mAh, while
 * others use an index into this table. */

static int rated_capacities[] = {
	0,
	920,	/* Samsung */
	920,	/* BYD */
	920,	/* Lishen */
	920,	/* NEC */
	1440,	/* Samsung */
	1440,	/* BYD */
#ifdef CONFIG_MACH_H4700
	1800,	/* HP iPAQ hx4700 3.7V 1800mAh (359113-001) */
#else
	1440,	/* Lishen */
#endif
	1440,	/* NEC */
	2880,	/* Samsung */
	2880,	/* BYD */
	2880,	/* Lishen */
	2880,	/* NEC */
#ifdef CONFIG_MACH_H4700
	0,
	3600,	/* HP iPAQ hx4700 3.7V 3600mAh (359114-001) */
#endif
};

/* array is level at temps 0°C, 10°C, 20°C, 30°C, 40°C
 * temp is in Celsius */

static int battery_interpolate(int array[], int temp) { int index, dt; if (temp <= 0) return array[0]; if (temp >= 40) return array[4]; index = temp / 10; dt = temp % 10; return array[index] + (((array[index + 1] - array[index]) * dt) / 10); }

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Anton Vorontsov82100.00%1100.00%
Total82100.00%1100.00%


static int ds2760_battery_read_status(struct ds2760_device_info *di) { int ret, i, start, count, scale[5]; if (di->update_time && time_before(jiffies, di->update_time + msecs_to_jiffies(cache_time))) return 0; /* The first time we read the entire contents of SRAM/EEPROM, * but after that we just read the interesting bits that change. */ if (di->update_time == 0) { start = 0; count = DS2760_DATA_SIZE; } else { start = DS2760_VOLTAGE_MSB; count = DS2760_TEMP_LSB - start + 1; } ret = w1_ds2760_read(di->w1_dev, di->raw + start, start, count); if (ret != count) { dev_warn(di->dev, "call to w1_ds2760_read failed (0x%p)\n", di->w1_dev); return 1; } di->update_time = jiffies; /* DS2760 reports voltage in units of 4.88mV, but the battery class * reports in units of uV, so convert by multiplying by 4880. */ di->voltage_raw = (di->raw[DS2760_VOLTAGE_MSB] << 3) | (di->raw[DS2760_VOLTAGE_LSB] >> 5); di->voltage_uV = di->voltage_raw * 4880; /* DS2760 reports current in signed units of 0.625mA, but the battery * class reports in units of µA, so convert by multiplying by 625. */ di->current_raw = (((signed char)di->raw[DS2760_CURRENT_MSB]) << 5) | (di->raw[DS2760_CURRENT_LSB] >> 3); di->current_uA = di->current_raw * 625; /* DS2760 reports accumulated current in signed units of 0.25mAh. */ di->accum_current_raw = (((signed char)di->raw[DS2760_CURRENT_ACCUM_MSB]) << 8) | di->raw[DS2760_CURRENT_ACCUM_LSB]; di->accum_current_uAh = di->accum_current_raw * 250; /* DS2760 reports temperature in signed units of 0.125°C, but the * battery class reports in units of 1/10 °C, so we convert by * multiplying by .125 * 10 = 1.25. */ di->temp_raw = (((signed char)di->raw[DS2760_TEMP_MSB]) << 3) | (di->raw[DS2760_TEMP_LSB] >> 5); di->temp_C = di->temp_raw + (di->temp_raw / 4); /* At least some battery monitors (e.g. HP iPAQ) store the battery's * maximum rated capacity. */ if (di->raw[DS2760_RATED_CAPACITY] < ARRAY_SIZE(rated_capacities)) di->rated_capacity = rated_capacities[ (unsigned int)di->raw[DS2760_RATED_CAPACITY]]; else di->rated_capacity = di->raw[DS2760_RATED_CAPACITY] * 10; di->rated_capacity *= 1000; /* convert to µAh */ /* Calculate the full level at the present temperature. */ di->full_active_uAh = di->raw[DS2760_ACTIVE_FULL] << 8 | di->raw[DS2760_ACTIVE_FULL + 1]; /* If the full_active_uAh value is not given, fall back to the rated * capacity. This is likely to happen when chips are not part of the * battery pack and is therefore not bootstrapped. */ if (di->full_active_uAh == 0) di->full_active_uAh = di->rated_capacity / 1000L; scale[0] = di->full_active_uAh; for (i = 1; i < 5; i++) scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 1 + i]; di->full_active_uAh = battery_interpolate(scale, di->temp_C / 10); di->full_active_uAh *= 1000; /* convert to µAh */ /* Calculate the empty level at the present temperature. */ scale[4] = di->raw[DS2760_ACTIVE_EMPTY + 4]; for (i = 3; i >= 0; i--) scale[i] = scale[i + 1] + di->raw[DS2760_ACTIVE_EMPTY + i]; di->empty_uAh = battery_interpolate(scale, di->temp_C / 10); di->empty_uAh *= 1000; /* convert to µAh */ if (di->full_active_uAh == di->empty_uAh) di->rem_capacity = 0; else /* From Maxim Application Note 131: remaining capacity = * ((ICA - Empty Value) / (Full Value - Empty Value)) x 100% */ di->rem_capacity = ((di->accum_current_uAh - di->empty_uAh) * 100L) / (di->full_active_uAh - di->empty_uAh); if (di->rem_capacity < 0) di->rem_capacity = 0; if (di->rem_capacity > 100) di->rem_capacity = 100; if (di->current_uA < -100L) di->life_sec = -((di->accum_current_uAh - di->empty_uAh) * 36L) / (di->current_uA / 100L); else di->life_sec = 0; return 0; }

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Anton Vorontsov60792.96%116.67%
Daniel Mack436.58%350.00%
Sven Neumann20.31%116.67%
Paul Parsons10.15%116.67%
Total653100.00%6100.00%


static void ds2760_battery_set_current_accum(struct ds2760_device_info *di, unsigned int acr_val) { unsigned char acr[2]; /* acr is in units of 0.25 mAh */ acr_val *= 4L; acr_val /= 1000; acr[0] = acr_val >> 8; acr[1] = acr_val & 0xff; if (w1_ds2760_write(di->w1_dev, acr, DS2760_CURRENT_ACCUM_MSB, 2) < 2) dev_warn(di->dev, "ACR write failed\n"); }

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Daniel Mack75100.00%1100.00%
Total75100.00%1100.00%


static void ds2760_battery_update_status(struct ds2760_device_info *di) { int old_charge_status = di->charge_status; ds2760_battery_read_status(di); if (di->charge_status == POWER_SUPPLY_STATUS_UNKNOWN) di->full_counter = 0; if (power_supply_am_i_supplied(di->bat)) { if (di->current_uA > 10000) { di->charge_status = POWER_SUPPLY_STATUS_CHARGING; di->full_counter = 0; } else if (di->current_uA < -5000) { if (di->charge_status != POWER_SUPPLY_STATUS_NOT_CHARGING) dev_notice(di->dev, "not enough power to " "charge\n"); di->charge_status = POWER_SUPPLY_STATUS_NOT_CHARGING; di->full_counter = 0; } else if (di->current_uA < 10000 && di->charge_status != POWER_SUPPLY_STATUS_FULL) { /* Don't consider the battery to be full unless * we've seen the current < 10 mA at least two * consecutive times. */ di->full_counter++; if (di->full_counter < 2) { di->charge_status = POWER_SUPPLY_STATUS_CHARGING; } else { di->charge_status = POWER_SUPPLY_STATUS_FULL; ds2760_battery_set_current_accum(di, di->full_active_uAh); } } } else { di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING; di->full_counter = 0; } if (di->charge_status != old_charge_status) power_supply_changed(di->bat); }

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Anton Vorontsov19597.99%150.00%
Daniel Mack42.01%150.00%
Total199100.00%2100.00%


static void ds2760_battery_write_status(struct ds2760_device_info *di, char status) { if (status == di->raw[DS2760_STATUS_REG]) return; w1_ds2760_write(di->w1_dev, &status, DS2760_STATUS_WRITE_REG, 1); w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); }

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Daniel Mack58100.00%1100.00%
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static void ds2760_battery_write_rated_capacity(struct ds2760_device_info *di, unsigned char rated_capacity) { if (rated_capacity == di->raw[DS2760_RATED_CAPACITY]) return; w1_ds2760_write(di->w1_dev, &rated_capacity, DS2760_RATED_CAPACITY, 1); w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); }

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Daniel Mack59100.00%1100.00%
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static void ds2760_battery_write_active_full(struct ds2760_device_info *di, int active_full) { unsigned char tmp[2] = { active_full >> 8, active_full & 0xff }; if (tmp[0] == di->raw[DS2760_ACTIVE_FULL] && tmp[1] == di->raw[DS2760_ACTIVE_FULL + 1]) return; w1_ds2760_write(di->w1_dev, tmp, DS2760_ACTIVE_FULL, sizeof(tmp)); w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK0); /* Write to the di->raw[] buffer directly - the DS2760_ACTIVE_FULL * values won't be read back by ds2760_battery_read_status() */ di->raw[DS2760_ACTIVE_FULL] = tmp[0]; di->raw[DS2760_ACTIVE_FULL + 1] = tmp[1]; }

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Daniel Mack121100.00%1100.00%
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static void ds2760_battery_work(struct work_struct *work) { struct ds2760_device_info *di = container_of(work, struct ds2760_device_info, monitor_work.work); const int interval = HZ * 60; dev_dbg(di->dev, "%s\n", __func__); ds2760_battery_update_status(di); queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval); }

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Anton Vorontsov6598.48%150.00%
Harvey Harrison11.52%150.00%
Total66100.00%2100.00%


static void ds2760_battery_external_power_changed(struct power_supply *psy) { struct ds2760_device_info *di = power_supply_get_drvdata(psy); dev_dbg(di->dev, "%s\n", __func__); mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10); }

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Anton Vorontsov4593.75%125.00%
Harvey Harrison12.08%125.00%
Tejun Heo12.08%125.00%
Krzysztof Kozlowski12.08%125.00%
Total48100.00%4100.00%


static void ds2760_battery_set_charged_work(struct work_struct *work) { char bias; struct ds2760_device_info *di = container_of(work, struct ds2760_device_info, set_charged_work.work); dev_dbg(di->dev, "%s\n", __func__); ds2760_battery_read_status(di); /* When we get notified by external circuitry that the battery is * considered fully charged now, we know that there is no current * flow any more. However, the ds2760's internal current meter is * too inaccurate to rely on - spec say something ~15% failure. * Hence, we use the current offset bias register to compensate * that error. */ if (!power_supply_am_i_supplied(di->bat)) return; bias = (signed char) di->current_raw + (signed char) di->raw[DS2760_CURRENT_OFFSET_BIAS]; dev_dbg(di->dev, "%s: bias = %d\n", __func__, bias); w1_ds2760_write(di->w1_dev, &bias, DS2760_CURRENT_OFFSET_BIAS, 1); w1_ds2760_store_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); w1_ds2760_recall_eeprom(di->w1_dev, DS2760_EEPROM_BLOCK1); /* Write to the di->raw[] buffer directly - the CURRENT_OFFSET_BIAS * value won't be read back by ds2760_battery_read_status() */ di->raw[DS2760_CURRENT_OFFSET_BIAS] = bias; }

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Daniel Mack135100.00%1100.00%
Total135100.00%1100.00%


static void ds2760_battery_set_charged(struct power_supply *psy) { struct ds2760_device_info *di = power_supply_get_drvdata(psy); /* postpone the actual work by 20 secs. This is for debouncing GPIO * signals and to let the current value settle. See AN4188. */ mod_delayed_work(di->monitor_wqueue, &di->set_charged_work, HZ * 20); }

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Daniel Mack3694.74%133.33%
Krzysztof Kozlowski12.63%133.33%
Tejun Heo12.63%133.33%
Total38100.00%3100.00%


static int ds2760_battery_get_property(struct power_supply *psy, enum power_supply_property psp, union power_supply_propval *val) { struct ds2760_device_info *di = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_STATUS: val->intval = di->charge_status; return 0; default: break; } ds2760_battery_read_status(di); switch (psp) { case POWER_SUPPLY_PROP_VOLTAGE_NOW: val->intval = di->voltage_uV; break; case POWER_SUPPLY_PROP_CURRENT_NOW: val->intval = di->current_uA; break; case POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN: val->intval = di->rated_capacity; break; case POWER_SUPPLY_PROP_CHARGE_FULL: val->intval = di->full_active_uAh; break; case POWER_SUPPLY_PROP_CHARGE_EMPTY: val->intval = di->empty_uAh; break; case POWER_SUPPLY_PROP_CHARGE_NOW: val->intval = di->accum_current_uAh; break; case POWER_SUPPLY_PROP_TEMP: val->intval = di->temp_C; break; case POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW: val->intval = di->life_sec; break; case POWER_SUPPLY_PROP_CAPACITY: val->intval = di->rem_capacity; break; default: return -EINVAL; } return 0; }

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Anton Vorontsov15486.03%133.33%
Daniel Mack2413.41%133.33%
Krzysztof Kozlowski10.56%133.33%
Total179100.00%3100.00%


static int ds2760_battery_set_property(struct power_supply *psy, enum power_supply_property psp, const union power_supply_propval *val) { struct ds2760_device_info *di = power_supply_get_drvdata(psy); switch (psp) { case POWER_SUPPLY_PROP_CHARGE_FULL: /* the interface counts in uAh, convert the value */ ds2760_battery_write_active_full(di, val->intval / 1000L); break; case POWER_SUPPLY_PROP_CHARGE_NOW: /* ds2760_battery_set_current_accum() does the conversion */ ds2760_battery_set_current_accum(di, val->intval); break; default: return -EPERM; } return 0; }

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Daniel Mack7498.67%150.00%
Krzysztof Kozlowski11.33%150.00%
Total75100.00%2100.00%


static int ds2760_battery_property_is_writeable(struct power_supply *psy, enum power_supply_property psp) { switch (psp) { case POWER_SUPPLY_PROP_CHARGE_FULL: case POWER_SUPPLY_PROP_CHARGE_NOW: return 1; default: break; } return 0; }

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Daniel Mack35100.00%1100.00%
Total35100.00%1100.00%

static enum power_supply_property ds2760_battery_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_VOLTAGE_NOW, POWER_SUPPLY_PROP_CURRENT_NOW, POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, POWER_SUPPLY_PROP_CHARGE_FULL, POWER_SUPPLY_PROP_CHARGE_EMPTY, POWER_SUPPLY_PROP_CHARGE_NOW, POWER_SUPPLY_PROP_TEMP, POWER_SUPPLY_PROP_TIME_TO_EMPTY_NOW, POWER_SUPPLY_PROP_CAPACITY, };
static int ds2760_battery_probe(struct platform_device *pdev) { struct power_supply_config psy_cfg = {}; char status; int retval = 0; struct ds2760_device_info *di; di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL); if (!di) { retval = -ENOMEM; goto di_alloc_failed; } platform_set_drvdata(pdev, di); di->dev = &pdev->dev; di->w1_dev = pdev->dev.parent; di->bat_desc.name = dev_name(&pdev->dev); di->bat_desc.type = POWER_SUPPLY_TYPE_BATTERY; di->bat_desc.properties = ds2760_battery_props; di->bat_desc.num_properties = ARRAY_SIZE(ds2760_battery_props); di->bat_desc.get_property = ds2760_battery_get_property; di->bat_desc.set_property = ds2760_battery_set_property; di->bat_desc.property_is_writeable = ds2760_battery_property_is_writeable; di->bat_desc.set_charged = ds2760_battery_set_charged; di->bat_desc.external_power_changed = ds2760_battery_external_power_changed; psy_cfg.drv_data = di; di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; /* enable sleep mode feature */ ds2760_battery_read_status(di); status = di->raw[DS2760_STATUS_REG]; if (pmod_enabled) status |= DS2760_STATUS_PMOD; else status &= ~DS2760_STATUS_PMOD; ds2760_battery_write_status(di, status); /* set rated capacity from module param */ if (rated_capacity) ds2760_battery_write_rated_capacity(di, rated_capacity); /* set current accumulator if given as parameter. * this should only be done for bootstrapping the value */ if (current_accum) ds2760_battery_set_current_accum(di, current_accum); di->bat = power_supply_register(&pdev->dev, &di->bat_desc, &psy_cfg); if (IS_ERR(di->bat)) { dev_err(di->dev, "failed to register battery\n"); retval = PTR_ERR(di->bat); goto batt_failed; } INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work); INIT_DELAYED_WORK(&di->set_charged_work, ds2760_battery_set_charged_work); di->monitor_wqueue = alloc_ordered_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM); if (!di->monitor_wqueue) { retval = -ESRCH; goto workqueue_failed; } queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ * 1); goto success; workqueue_failed: power_supply_unregister(di->bat); batt_failed: di_alloc_failed: success: return retval; }

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Anton Vorontsov20152.21%18.33%
Daniel Mack12432.21%650.00%
Krzysztof Kozlowski4311.17%216.67%
Kay Sievers82.08%18.33%
Jingoo Han61.56%18.33%
Bhaktipriya Shridhar30.78%18.33%
Total385100.00%12100.00%


static int ds2760_battery_remove(struct platform_device *pdev) { struct ds2760_device_info *di = platform_get_drvdata(pdev); cancel_delayed_work_sync(&di->monitor_work); cancel_delayed_work_sync(&di->set_charged_work); destroy_workqueue(di->monitor_wqueue); power_supply_unregister(di->bat); return 0; }

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Anton Vorontsov4583.33%133.33%
Daniel Mack712.96%133.33%
Tejun Heo23.70%133.33%
Total54100.00%3100.00%

#ifdef CONFIG_PM
static int ds2760_battery_suspend(struct platform_device *pdev, pm_message_t state) { struct ds2760_device_info *di = platform_get_drvdata(pdev); di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; return 0; }

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Anton Vorontsov33100.00%1100.00%
Total33100.00%1100.00%


static int ds2760_battery_resume(struct platform_device *pdev) { struct ds2760_device_info *di = platform_get_drvdata(pdev); di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN; power_supply_changed(di->bat); mod_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ); return 0; }

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Anton Vorontsov5098.04%150.00%
Tejun Heo11.96%150.00%
Total51100.00%2100.00%

#else #define ds2760_battery_suspend NULL #define ds2760_battery_resume NULL #endif /* CONFIG_PM */ MODULE_ALIAS("platform:ds2760-battery"); static struct platform_driver ds2760_battery_driver = { .driver = { .name = "ds2760-battery", }, .probe = ds2760_battery_probe, .remove = ds2760_battery_remove, .suspend = ds2760_battery_suspend, .resume = ds2760_battery_resume, }; module_platform_driver(ds2760_battery_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>, " "Matt Reimer <mreimer@vpop.net>, " "Anton Vorontsov <cbou@mail.ru>"); MODULE_DESCRIPTION("ds2760 battery driver");

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Anton Vorontsov177064.43%13.45%
Daniel Mack86431.45%1034.48%
Krzysztof Kozlowski521.89%26.90%
Paul Parsons220.80%310.34%
Kay Sievers130.47%26.90%
Tejun Heo80.29%310.34%
Jingoo Han60.22%13.45%
Bhaktipriya Shridhar30.11%13.45%
Harvey Harrison20.07%13.45%
Sven Neumann20.07%13.45%
Axel Lin20.07%13.45%
Andrew F. Davis10.04%13.45%
Rusty Russell10.04%13.45%
Sebastian Reichel10.04%13.45%
Total2747100.00%29100.00%
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