[BATTERY] 1-Wire ds2760 chip battery driver (fe0e3153) · Commits · e / devices / android_kernel_sony_msm8994

drivers/power/Kconfig

+7 −0

Original line number	Diff line number	Diff line
		@@ -28,4 +28,11 @@ config APM_POWER
		Say Y here to enable support APM status emulation using
		battery class devices.

		config BATTERY_DS2760
		tristate "DS2760 battery driver (HP iPAQ & others)"
		select W1
		select W1_SLAVE_DS2760
		help
		Say Y here to enable support for batteries with ds2760 chip.

		endif # POWER_SUPPLY

drivers/power/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -16,3 +16,5 @@ obj-$(CONFIG_POWER_SUPPLY) += power_supply.o

		obj-$(CONFIG_PDA_POWER) += pda_power.o
		obj-$(CONFIG_APM_POWER) += apm_power.o

		obj-$(CONFIG_BATTERY_DS2760) += ds2760_battery.o

drivers/power/ds2760_battery.c

0 → 100644

+470 −0

Original line number	Diff line number	Diff line
		/*
		* 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/platform_device.h>
		#include <linux/power_supply.h>

		#include "../w1/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 device *w1_dev;
		struct workqueue_struct *monitor_wqueue;
		struct delayed_work monitor_work;
		};

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

		/* 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 */
		1440, /* Lishen */
		1440, /* NEC */
		2880, /* Samsung */
		2880, /* BYD */
		2880, /* Lishen */
		2880 /* NEC */
		};

		/* 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);
		}

		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];

		scale[0] = di->raw[DS2760_ACTIVE_FULL] << 8 \|
		di->raw[DS2760_ACTIVE_FULL + 1];
		for (i = 1; i < 5; i++)
		scale[i] = scale[i - 1] + di->raw[DS2760_ACTIVE_FULL + 2 + 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 */

		/* 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)
		di->life_sec = -((di->accum_current_uAh - di->empty_uAh) *
		3600L) / di->current_uA;
		else
		di->life_sec = 0;

		return 0;
		}

		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 {
		unsigned char acr[2];
		int acr_val;

		/* acr is in units of 0.25 mAh */
		acr_val = di->full_active_uAh * 4L / 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 reset failed\n");

		di->charge_status = POWER_SUPPLY_STATUS_FULL;
		}
		}
		} else {
		di->charge_status = POWER_SUPPLY_STATUS_DISCHARGING;
		di->full_counter = 0;
		}

		if (di->charge_status != old_charge_status)
		power_supply_changed(&di->bat);

		return;
		}

		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", __FUNCTION__);

		ds2760_battery_update_status(di);
		queue_delayed_work(di->monitor_wqueue, &di->monitor_work, interval);

		return;
		}

		#define to_ds2760_device_info(x) container_of((x), struct ds2760_device_info, \
		bat);

		static void ds2760_battery_external_power_changed(struct power_supply *psy)
		{
		struct ds2760_device_info *di = to_ds2760_device_info(psy);

		dev_dbg(di->dev, "%s\n", __FUNCTION__);

		cancel_delayed_work(&di->monitor_work);
		queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ/10);

		return;
		}

		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 = to_ds2760_device_info(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;
		default:
		return -EINVAL;
		}

		return 0;
		}

		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,
		};

		static int ds2760_battery_probe(struct platform_device *pdev)
		{
		int retval = 0;
		struct ds2760_device_info *di;
		struct ds2760_platform_data *pdata;

		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 = pdev->dev.bus_id;
		di->bat.type = POWER_SUPPLY_TYPE_BATTERY;
		di->bat.properties = ds2760_battery_props;
		di->bat.num_properties = ARRAY_SIZE(ds2760_battery_props);
		di->bat.get_property = ds2760_battery_get_property;
		di->bat.external_power_changed =
		ds2760_battery_external_power_changed;

		di->charge_status = POWER_SUPPLY_STATUS_UNKNOWN;

		retval = power_supply_register(&pdev->dev, &di->bat);
		if (retval) {
		dev_err(di->dev, "failed to register battery");
		goto batt_failed;
		}

		INIT_DELAYED_WORK(&di->monitor_work, ds2760_battery_work);
		di->monitor_wqueue = create_singlethread_workqueue(pdev->dev.bus_id);
		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:
		kfree(di);
		di_alloc_failed:
		success:
		return retval;
		}

		static int ds2760_battery_remove(struct platform_device *pdev)
		{
		struct ds2760_device_info *di = platform_get_drvdata(pdev);

		cancel_rearming_delayed_workqueue(di->monitor_wqueue,
		&di->monitor_work);
		destroy_workqueue(di->monitor_wqueue);
		power_supply_unregister(&di->bat);

		return 0;
		}

		#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;
		}

		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);

		cancel_delayed_work(&di->monitor_work);
		queue_delayed_work(di->monitor_wqueue, &di->monitor_work, HZ);

		return 0;
		}

		#else

		#define ds2760_battery_suspend NULL
		#define ds2760_battery_resume NULL

		#endif /* CONFIG_PM */

		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,
		};

		static int __init ds2760_battery_init(void)
		{
		return platform_driver_register(&ds2760_battery_driver);
		}

		static void __exit ds2760_battery_exit(void)
		{
		platform_driver_unregister(&ds2760_battery_driver);
		return;
		}

		module_init(ds2760_battery_init);
		module_exit(ds2760_battery_exit);

		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");