Add hdq and bq27000 driver.

1 files changed, 477 insertions, 0 deletions

diff --git a/drivers/power/bq27000_battery.c b/drivers/power/bq27000_battery.c
new file mode 100644
index 00000000000..32655dce1f3
--- /dev/null
+++ b/drivers/power/bq27000_battery.c
@@ -0,0 +1,477 @@
+/*
+ * 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>
+
+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 (&regs, &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");