[deliverable/linux.git] / drivers / power / wm8350_power.c

/*
 * Battery driver for wm8350 PMIC
 *
 * Copyright 2007, 2008 Wolfson Microelectronics PLC.
 *
 * Based on OLPC Battery Driver
 *
 * Copyright 2006  David Woodhouse <dwmw2@infradead.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/mfd/wm8350/supply.h>
#include <linux/mfd/wm8350/core.h>
#include <linux/mfd/wm8350/comparator.h>

static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
{
	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
		* WM8350_AUX_COEFF;
}

static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
{
	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
		* WM8350_AUX_COEFF;
}

static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
{
	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
		* WM8350_AUX_COEFF;
}

#define WM8350_BATT_SUPPLY	1
#define WM8350_USB_SUPPLY	2
#define WM8350_LINE_SUPPLY	4

static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
{
	if (!wm8350->power.rev_g_coeff)
		return (((min - 30) / 15) & 0xf) << 8;
	else
		return (((min - 30) / 30) & 0xf) << 8;
}

static int wm8350_get_supplies(struct wm8350 *wm8350)
{
	u16 sm, ov, co, chrg;
	int supplies = 0;

	sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
	ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
	co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
	chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);

	/* USB_SM */
	sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;

	/* CHG_ISEL */
	chrg &= WM8350_CHG_ISEL_MASK;

	/* If the USB state machine is active then we're using that with or
	 * without battery, otherwise check for wall supply */
	if (((sm == WM8350_USB_SM_100_SLV) ||
	     (sm == WM8350_USB_SM_500_SLV) ||
	     (sm == WM8350_USB_SM_STDBY_SLV))
	    && !(ov & WM8350_USB_LIMIT_OVRDE))
		supplies = WM8350_USB_SUPPLY;
	else if (((sm == WM8350_USB_SM_100_SLV) ||
		  (sm == WM8350_USB_SM_500_SLV) ||
		  (sm == WM8350_USB_SM_STDBY_SLV))
		 && (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
		supplies = WM8350_USB_SUPPLY | WM8350_BATT_SUPPLY;
	else if (co & WM8350_WALL_FB_OVRDE)
		supplies = WM8350_LINE_SUPPLY;
	else
		supplies = WM8350_BATT_SUPPLY;

	return supplies;
}

static int wm8350_charger_config(struct wm8350 *wm8350,
				 struct wm8350_charger_policy *policy)
{
	u16 reg, eoc_mA, fast_limit_mA;

	if (!policy) {
		dev_warn(wm8350->dev,
			 "No charger policy, charger not configured.\n");
		return -EINVAL;
	}

	/* make sure USB fast charge current is not > 500mA */
	if (policy->fast_limit_USB_mA > 500) {
		dev_err(wm8350->dev, "USB fast charge > 500mA\n");
		return -EINVAL;
	}

	eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);

	wm8350_reg_unlock(wm8350);

	reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
		& WM8350_CHG_ENA_R168;
	wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
			 reg | eoc_mA | policy->trickle_start_mV |
			 WM8350_CHG_TRICKLE_TEMP_CHOKE |
			 WM8350_CHG_TRICKLE_USB_CHOKE |
			 WM8350_CHG_FAST_USB_THROTTLE);

	if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
		fast_limit_mA =
			WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
		wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
			    policy->charge_mV | policy->trickle_charge_USB_mA |
			    fast_limit_mA | wm8350_charge_time_min(wm8350,
						policy->charge_timeout));

	} else {
		fast_limit_mA =
			WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
		wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
			    policy->charge_mV | policy->trickle_charge_mA |
			    fast_limit_mA | wm8350_charge_time_min(wm8350,
						policy->charge_timeout));
	}

	wm8350_reg_lock(wm8350);
	return 0;
}

static int wm8350_batt_status(struct wm8350 *wm8350)
{
	u16 state;

	state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
	state &= WM8350_CHG_STS_MASK;

	switch (state) {
	case WM8350_CHG_STS_OFF:
		return POWER_SUPPLY_STATUS_DISCHARGING;

	case WM8350_CHG_STS_TRICKLE:
	case WM8350_CHG_STS_FAST:
		return POWER_SUPPLY_STATUS_CHARGING;

	default:
		return POWER_SUPPLY_STATUS_UNKNOWN;
	}
}

static ssize_t charger_state_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	char *charge;
	int state;

	state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
	    WM8350_CHG_STS_MASK;
	switch (state) {
	case WM8350_CHG_STS_OFF:
		charge = "Charger Off";
		break;
	case WM8350_CHG_STS_TRICKLE:
		charge = "Trickle Charging";
		break;
	case WM8350_CHG_STS_FAST:
		charge = "Fast Charging";
		break;
	default:
		return 0;
	}

	return sprintf(buf, "%s\n", charge);
}

static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);

static void wm8350_charger_handler(struct wm8350 *wm8350, int irq, void *data)
{
	struct wm8350_power *power = &wm8350->power;
	struct wm8350_charger_policy *policy = power->policy;

	switch (irq) {
	case WM8350_IRQ_CHG_BAT_HOT:
		dev_err(wm8350->dev, "battery too hot\n");
		break;
	case WM8350_IRQ_CHG_BAT_COLD:
		dev_err(wm8350->dev, "battery too cold\n");
		break;
	case WM8350_IRQ_CHG_BAT_FAIL:
		dev_err(wm8350->dev, "battery failed\n");
		break;
	case WM8350_IRQ_CHG_TO:
		dev_err(wm8350->dev, "charger timeout\n");
		break;
	case WM8350_IRQ_CHG_END:
		power_supply_changed(&power->battery);
		break;
	case WM8350_IRQ_CHG_START:
		power_supply_changed(&power->battery);
		break;

	case WM8350_IRQ_CHG_FAST_RDY:
		dev_dbg(wm8350->dev, "fast charger ready\n");
		wm8350_charger_config(wm8350, policy);
		wm8350_reg_unlock(wm8350);
		wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
				WM8350_CHG_FAST);
		wm8350_reg_lock(wm8350);
		break;

	case WM8350_IRQ_CHG_VBATT_LT_3P9:
		dev_warn(wm8350->dev, "battery < 3.9V\n");
		break;
	case WM8350_IRQ_CHG_VBATT_LT_3P1:
		dev_warn(wm8350->dev, "battery < 3.1V\n");
		break;
	case WM8350_IRQ_CHG_VBATT_LT_2P85:
		dev_warn(wm8350->dev, "battery < 2.85V\n");
		break;

		/* Supply change.  We will overnotify but it should do
		 * no harm. */
	case WM8350_IRQ_EXT_USB_FB:
	case WM8350_IRQ_EXT_WALL_FB:
		wm8350_charger_config(wm8350, policy);
	case WM8350_IRQ_EXT_BAT_FB:   /* Fall through */
		power_supply_changed(&power->battery);
		power_supply_changed(&power->usb);
		power_supply_changed(&power->ac);
		break;

	default:
		dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
	}
}

/*********************************************************************
 *		AC Power
 *********************************************************************/
static int wm8350_ac_get_prop(struct power_supply *psy,
			      enum power_supply_property psp,
			      union power_supply_propval *val)
{
	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = !!(wm8350_get_supplies(wm8350) &
				 WM8350_LINE_SUPPLY);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = wm8350_read_line_uvolts(wm8350);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static enum power_supply_property wm8350_ac_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/*********************************************************************
 *		USB Power
 *********************************************************************/
static int wm8350_usb_get_prop(struct power_supply *psy,
			       enum power_supply_property psp,
			       union power_supply_propval *val)
{
	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = !!(wm8350_get_supplies(wm8350) &
				 WM8350_USB_SUPPLY);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = wm8350_read_usb_uvolts(wm8350);
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

static enum power_supply_property wm8350_usb_props[] = {
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/*********************************************************************
 *		Battery properties
 *********************************************************************/

static int wm8350_bat_get_property(struct power_supply *psy,
				   enum power_supply_property psp,
				   union power_supply_propval *val)
{
	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
	int ret = 0;

	switch (psp) {
	case POWER_SUPPLY_PROP_STATUS:
		val->intval = wm8350_batt_status(wm8350);
		break;
	case POWER_SUPPLY_PROP_ONLINE:
		val->intval = !!(wm8350_get_supplies(wm8350) &
				 WM8350_BATT_SUPPLY);
		break;
	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
		val->intval = wm8350_read_battery_uvolts(wm8350);
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static enum power_supply_property wm8350_bat_props[] = {
	POWER_SUPPLY_PROP_STATUS,
	POWER_SUPPLY_PROP_ONLINE,
	POWER_SUPPLY_PROP_VOLTAGE_NOW,
};

/*********************************************************************
 *		Initialisation
 *********************************************************************/

static void wm8350_init_charger(struct wm8350 *wm8350)
{
	/* register our interest in charger events */
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);

	/* and supply change events */
	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
			    wm8350_charger_handler, NULL);
	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
}

static void free_charger_irq(struct wm8350 *wm8350)
{
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
}

static __devinit int wm8350_power_probe(struct platform_device *pdev)
{
	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
	struct wm8350_power *power = &wm8350->power;
	struct wm8350_charger_policy *policy = power->policy;
	struct power_supply *usb = &power->usb;
	struct power_supply *battery = &power->battery;
	struct power_supply *ac = &power->ac;
	int ret;

	ac->name = "wm8350-ac";
	ac->type = POWER_SUPPLY_TYPE_MAINS;
	ac->properties = wm8350_ac_props;
	ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
	ac->get_property = wm8350_ac_get_prop;
	ret = power_supply_register(&pdev->dev, ac);
	if (ret)
		return ret;

	battery->name = "wm8350-battery";
	battery->properties = wm8350_bat_props;
	battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
	battery->get_property = wm8350_bat_get_property;
	battery->use_for_apm = 1;
	ret = power_supply_register(&pdev->dev, battery);
	if (ret)
		goto battery_failed;

	usb->name = "wm8350-usb",
	usb->type = POWER_SUPPLY_TYPE_USB;
	usb->properties = wm8350_usb_props;
	usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
	usb->get_property = wm8350_usb_get_prop;
	ret = power_supply_register(&pdev->dev, usb);
	if (ret)
		goto usb_failed;

	ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
	if (ret < 0)
		dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
	ret = 0;

	wm8350_init_charger(wm8350);
	if (wm8350_charger_config(wm8350, policy) == 0) {
		wm8350_reg_unlock(wm8350);
		wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
		wm8350_reg_lock(wm8350);
	}

	return ret;

usb_failed:
	power_supply_unregister(battery);
battery_failed:
	power_supply_unregister(ac);

	return ret;
}

static __devexit int wm8350_power_remove(struct platform_device *pdev)
{
	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
	struct wm8350_power *power = &wm8350->power;

	free_charger_irq(wm8350);
	device_remove_file(&pdev->dev, &dev_attr_charger_state);
	power_supply_unregister(&power->battery);
	power_supply_unregister(&power->ac);
	power_supply_unregister(&power->usb);
	return 0;
}

static struct platform_driver wm8350_power_driver = {
	.probe = wm8350_power_probe,
	.remove = __devexit_p(wm8350_power_remove),
	.driver = {
		.name = "wm8350-power",
	},
};

static int __init wm8350_power_init(void)
{
	return platform_driver_register(&wm8350_power_driver);
}
module_init(wm8350_power_init);

static void __exit wm8350_power_exit(void)
{
	platform_driver_unregister(&wm8350_power_driver);
}
module_exit(wm8350_power_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Power supply driver for WM8350");
MODULE_ALIAS("platform:wm8350-power");
Commit	Line	Data
14431aa0 MB	1	/*
	2	* Battery driver for wm8350 PMIC
	3	*
	4	* Copyright 2007, 2008 Wolfson Microelectronics PLC.
	5	*
	6	* Based on OLPC Battery Driver
	7	*
	8	* Copyright 2006 David Woodhouse <dwmw2@infradead.org>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/err.h>
	17	#include <linux/platform_device.h>
	18	#include <linux/power_supply.h>
	19	#include <linux/mfd/wm8350/supply.h>
	20	#include <linux/mfd/wm8350/core.h>
	21	#include <linux/mfd/wm8350/comparator.h>
	22
	23	static int wm8350_read_battery_uvolts(struct wm8350 *wm8350)
	24	{
	25	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_BATT, 0, 0)
	26	* WM8350_AUX_COEFF;
	27	}
	28
	29	static int wm8350_read_line_uvolts(struct wm8350 *wm8350)
	30	{
	31	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_LINE, 0, 0)
	32	* WM8350_AUX_COEFF;
	33	}
	34
	35	static int wm8350_read_usb_uvolts(struct wm8350 *wm8350)
	36	{
	37	return wm8350_read_auxadc(wm8350, WM8350_AUXADC_USB, 0, 0)
	38	* WM8350_AUX_COEFF;
	39	}
	40
	41	#define WM8350_BATT_SUPPLY 1
	42	#define WM8350_USB_SUPPLY 2
	43	#define WM8350_LINE_SUPPLY 4
	44
	45	static inline int wm8350_charge_time_min(struct wm8350 *wm8350, int min)
	46	{
d756f4a4	47	if (!wm8350->power.rev_g_coeff)
14431aa0 MB	48	return (((min - 30) / 15) & 0xf) << 8;
	49	else
	50	return (((min - 30) / 30) & 0xf) << 8;
	51	}
	52
	53	static int wm8350_get_supplies(struct wm8350 *wm8350)
	54	{
	55	u16 sm, ov, co, chrg;
	56	int supplies = 0;
	57
	58	sm = wm8350_reg_read(wm8350, WM8350_STATE_MACHINE_STATUS);
	59	ov = wm8350_reg_read(wm8350, WM8350_MISC_OVERRIDES);
	60	co = wm8350_reg_read(wm8350, WM8350_COMPARATOR_OVERRIDES);
	61	chrg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
	62
	63	/* USB_SM */
	64	sm = (sm & WM8350_USB_SM_MASK) >> WM8350_USB_SM_SHIFT;
	65
	66	/* CHG_ISEL */
	67	chrg &= WM8350_CHG_ISEL_MASK;
	68
	69	/* If the USB state machine is active then we're using that with or
	70	* without battery, otherwise check for wall supply */
	71	if (((sm == WM8350_USB_SM_100_SLV) \|\|
	72	(sm == WM8350_USB_SM_500_SLV) \|\|
	73	(sm == WM8350_USB_SM_STDBY_SLV))
	74	&& !(ov & WM8350_USB_LIMIT_OVRDE))
	75	supplies = WM8350_USB_SUPPLY;
	76	else if (((sm == WM8350_USB_SM_100_SLV) \|\|
	77	(sm == WM8350_USB_SM_500_SLV) \|\|
	78	(sm == WM8350_USB_SM_STDBY_SLV))
	79	&& (ov & WM8350_USB_LIMIT_OVRDE) && (chrg == 0))
	80	supplies = WM8350_USB_SUPPLY \| WM8350_BATT_SUPPLY;
	81	else if (co & WM8350_WALL_FB_OVRDE)
	82	supplies = WM8350_LINE_SUPPLY;
	83	else
	84	supplies = WM8350_BATT_SUPPLY;
	85
	86	return supplies;
	87	}
	88
	89	static int wm8350_charger_config(struct wm8350 *wm8350,
	90	struct wm8350_charger_policy *policy)
	91	{
	92	u16 reg, eoc_mA, fast_limit_mA;
	93
	94	if (!policy) {
	95	dev_warn(wm8350->dev,
	96	"No charger policy, charger not configured.\n");
	97	return -EINVAL;
	98	}
	99
	100	/* make sure USB fast charge current is not > 500mA */
	101	if (policy->fast_limit_USB_mA > 500) {
	102	dev_err(wm8350->dev, "USB fast charge > 500mA\n");
	103	return -EINVAL;
	104	}
	105
	106	eoc_mA = WM8350_CHG_EOC_mA(policy->eoc_mA);
	107
	108	wm8350_reg_unlock(wm8350);
	109
	110	reg = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1)
	111	& WM8350_CHG_ENA_R168;
112	wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
113	reg \| eoc_mA \| policy->trickle_start_mV \|
114	WM8350_CHG_TRICKLE_TEMP_CHOKE \|
115	WM8350_CHG_TRICKLE_USB_CHOKE \|
116	WM8350_CHG_FAST_USB_THROTTLE);
117
118	if (wm8350_get_supplies(wm8350) & WM8350_USB_SUPPLY) {
119	fast_limit_mA =
120	WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_USB_mA);
121	wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
122	policy->charge_mV \| policy->trickle_charge_USB_mA \|
123	fast_limit_mA \| wm8350_charge_time_min(wm8350,
124	policy->charge_timeout));
125
126	} else {
127	fast_limit_mA =
128	WM8350_CHG_FAST_LIMIT_mA(policy->fast_limit_mA);
129	wm8350_reg_write(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2,
130	policy->charge_mV \| policy->trickle_charge_mA \|
131	fast_limit_mA \| wm8350_charge_time_min(wm8350,
132	policy->charge_timeout));
133	}
134
135	wm8350_reg_lock(wm8350);
136	return 0;
137	}
138
139	static int wm8350_batt_status(struct wm8350 *wm8350)
140	{
141	u16 state;
142
143	state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2);
144	state &= WM8350_CHG_STS_MASK;
145
146	switch (state) {
147	case WM8350_CHG_STS_OFF:
148	return POWER_SUPPLY_STATUS_DISCHARGING;
149
150	case WM8350_CHG_STS_TRICKLE:
151	case WM8350_CHG_STS_FAST:
152	return POWER_SUPPLY_STATUS_CHARGING;
153
154	default:
155	return POWER_SUPPLY_STATUS_UNKNOWN;
156	}
157	}
158
159	static ssize_t charger_state_show(struct device *dev,
160	struct device_attribute attr, char buf)
161	{
162	struct wm8350 *wm8350 = dev_get_drvdata(dev);
163	char *charge;
164	int state;
165
166	state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
167	WM8350_CHG_STS_MASK;
168	switch (state) {
169	case WM8350_CHG_STS_OFF:
170	charge = "Charger Off";
171	break;
172	case WM8350_CHG_STS_TRICKLE:
173	charge = "Trickle Charging";
174	break;
175	case WM8350_CHG_STS_FAST:
176	charge = "Fast Charging";
177	break;
178	default:
179	return 0;
180	}
181
182	return sprintf(buf, "%s\n", charge);
183	}
184
185	static DEVICE_ATTR(charger_state, 0444, charger_state_show, NULL);
186
187	static void wm8350_charger_handler(struct wm8350 wm8350, int irq, void data)
188	{
189	struct wm8350_power *power = &wm8350->power;
190	struct wm8350_charger_policy *policy = power->policy;
191
192	switch (irq) {
193	case WM8350_IRQ_CHG_BAT_HOT:
194	dev_err(wm8350->dev, "battery too hot\n");
195	break;
196	case WM8350_IRQ_CHG_BAT_COLD:
197	dev_err(wm8350->dev, "battery too cold\n");
198	break;
199	case WM8350_IRQ_CHG_BAT_FAIL:
200	dev_err(wm8350->dev, "battery failed\n");
201	break;
202	case WM8350_IRQ_CHG_TO:
203	dev_err(wm8350->dev, "charger timeout\n");
204	break;
205	case WM8350_IRQ_CHG_END:
206	power_supply_changed(&power->battery);
207	break;
208	case WM8350_IRQ_CHG_START:
209	power_supply_changed(&power->battery);
210	break;
211
212	case WM8350_IRQ_CHG_FAST_RDY:
213	dev_dbg(wm8350->dev, "fast charger ready\n");
214	wm8350_charger_config(wm8350, policy);
215	wm8350_reg_unlock(wm8350);
216	wm8350_set_bits(wm8350, WM8350_BATTERY_CHARGER_CONTROL_1,
217	WM8350_CHG_FAST);
218	wm8350_reg_lock(wm8350);
219	break;
220
221	case WM8350_IRQ_CHG_VBATT_LT_3P9:
222	dev_warn(wm8350->dev, "battery < 3.9V\n");
223	break;
224	case WM8350_IRQ_CHG_VBATT_LT_3P1:
225	dev_warn(wm8350->dev, "battery < 3.1V\n");
226	break;
227	case WM8350_IRQ_CHG_VBATT_LT_2P85:
228	dev_warn(wm8350->dev, "battery < 2.85V\n");
229	break;
230
231	/* Supply change. We will overnotify but it should do
232	* no harm. */
233	case WM8350_IRQ_EXT_USB_FB:
234	case WM8350_IRQ_EXT_WALL_FB:
235	wm8350_charger_config(wm8350, policy);
236	case WM8350_IRQ_EXT_BAT_FB: /* Fall through */
237	power_supply_changed(&power->battery);
238	power_supply_changed(&power->usb);
239	power_supply_changed(&power->ac);
240	break;
241
242	default:
243	dev_err(wm8350->dev, "Unknown interrupt %d\n", irq);
244	}
245	}
246
247	/*********************************************************************
248	* AC Power
249	*********************************************************************/
250	static int wm8350_ac_get_prop(struct power_supply *psy,
251	enum power_supply_property psp,
252	union power_supply_propval *val)
253	{
254	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
255	int ret = 0;
256
257	switch (psp) {
258	case POWER_SUPPLY_PROP_ONLINE:
259	val->intval = !!(wm8350_get_supplies(wm8350) &
260	WM8350_LINE_SUPPLY);
261	break;
262	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
263	val->intval = wm8350_read_line_uvolts(wm8350);
264	break;
265	default:
266	ret = -EINVAL;
267	break;
268	}
269	return ret;
270	}
271
272	static enum power_supply_property wm8350_ac_props[] = {
273	POWER_SUPPLY_PROP_ONLINE,
274	POWER_SUPPLY_PROP_VOLTAGE_NOW,
275	};
276
277	/*********************************************************************
278	* USB Power
279	*********************************************************************/
280	static int wm8350_usb_get_prop(struct power_supply *psy,
281	enum power_supply_property psp,
282	union power_supply_propval *val)
283	{
284	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
285	int ret = 0;
286
287	switch (psp) {
288	case POWER_SUPPLY_PROP_ONLINE:
289	val->intval = !!(wm8350_get_supplies(wm8350) &
290	WM8350_USB_SUPPLY);
291	break;
292	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
293	val->intval = wm8350_read_usb_uvolts(wm8350);
294	break;
295	default:
296	ret = -EINVAL;
297	break;
298	}
299	return ret;
300	}
301
302	static enum power_supply_property wm8350_usb_props[] = {
303	POWER_SUPPLY_PROP_ONLINE,
304	POWER_SUPPLY_PROP_VOLTAGE_NOW,
305	};
306
307	/*********************************************************************
308	* Battery properties
309	*********************************************************************/
310
311	static int wm8350_bat_get_property(struct power_supply *psy,
312	enum power_supply_property psp,
313	union power_supply_propval *val)
314	{
315	struct wm8350 *wm8350 = dev_get_drvdata(psy->dev->parent);
316	int ret = 0;
317
318	switch (psp) {
319	case POWER_SUPPLY_PROP_STATUS:
320	val->intval = wm8350_batt_status(wm8350);
321	break;
322	case POWER_SUPPLY_PROP_ONLINE:
323	val->intval = !!(wm8350_get_supplies(wm8350) &
324	WM8350_BATT_SUPPLY);
325	break;
326	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
327	val->intval = wm8350_read_battery_uvolts(wm8350);
328	break;
329	default:
330	ret = -EINVAL;
331	break;
332	}
333
334	return ret;
335	}
336
337	static enum power_supply_property wm8350_bat_props[] = {
338	POWER_SUPPLY_PROP_STATUS,
339	POWER_SUPPLY_PROP_ONLINE,
340	POWER_SUPPLY_PROP_VOLTAGE_NOW,
341	};
342
343	/*********************************************************************
344	* Initialisation
345	*********************************************************************/
346
347	static void wm8350_init_charger(struct wm8350 *wm8350)
348	{
349	/* register our interest in charger events */
350	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT,
351	wm8350_charger_handler, NULL);
352	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
353	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
354	wm8350_charger_handler, NULL);
355	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
356	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
357	wm8350_charger_handler, NULL);
358	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
359	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
360	wm8350_charger_handler, NULL);
361	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_TO);
362	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
363	wm8350_charger_handler, NULL);
364	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_END);
365	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
366	wm8350_charger_handler, NULL);
367	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_START);
368	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
369	wm8350_charger_handler, NULL);
370	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY);
371	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
372	wm8350_charger_handler, NULL);
373	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
374	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
375	wm8350_charger_handler, NULL);
376	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
377	wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
378	wm8350_charger_handler, NULL);
379	wm8350_unmask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
380
381	/* and supply change events */
382	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
383	wm8350_charger_handler, NULL);
384	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
385	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
386	wm8350_charger_handler, NULL);
387	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
388	wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
389	wm8350_charger_handler, NULL);
390	wm8350_unmask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
391	}
392
393	static void free_charger_irq(struct wm8350 *wm8350)
394	{
395	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
396	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT);
397	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
398	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
399	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
400	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
401	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_TO);
402	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
403	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_END);
404	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
405	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_START);
406	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
407	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
408	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
409	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
410	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
411	wm8350_mask_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
412	wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
413	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
414	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
415	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
416	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB);
417	wm8350_mask_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
418	wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB);
419	}
420
421	static __devinit int wm8350_power_probe(struct platform_device *pdev)
422	{
423	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
424	struct wm8350_power *power = &wm8350->power;
425	struct wm8350_charger_policy *policy = power->policy;
426	struct power_supply *usb = &power->usb;
427	struct power_supply *battery = &power->battery;
428	struct power_supply *ac = &power->ac;
429	int ret;
430
431	ac->name = "wm8350-ac";
432	ac->type = POWER_SUPPLY_TYPE_MAINS;
433	ac->properties = wm8350_ac_props;
434	ac->num_properties = ARRAY_SIZE(wm8350_ac_props);
435	ac->get_property = wm8350_ac_get_prop;
436	ret = power_supply_register(&pdev->dev, ac);
437	if (ret)
438	return ret;
439
440	battery->name = "wm8350-battery";
441	battery->properties = wm8350_bat_props;
442	battery->num_properties = ARRAY_SIZE(wm8350_bat_props);
443	battery->get_property = wm8350_bat_get_property;
444	battery->use_for_apm = 1;
445	ret = power_supply_register(&pdev->dev, battery);
446	if (ret)
447	goto battery_failed;
448
449	usb->name = "wm8350-usb",
450	usb->type = POWER_SUPPLY_TYPE_USB;
451	usb->properties = wm8350_usb_props;
452	usb->num_properties = ARRAY_SIZE(wm8350_usb_props);
453	usb->get_property = wm8350_usb_get_prop;
454	ret = power_supply_register(&pdev->dev, usb);
455	if (ret)
456	goto usb_failed;
457
458	ret = device_create_file(&pdev->dev, &dev_attr_charger_state);
459	if (ret < 0)
460	dev_warn(wm8350->dev, "failed to add charge sysfs: %d\n", ret);
461	ret = 0;
462
463	wm8350_init_charger(wm8350);
464	if (wm8350_charger_config(wm8350, policy) == 0) {
465	wm8350_reg_unlock(wm8350);
466	wm8350_set_bits(wm8350, WM8350_POWER_MGMT_5, WM8350_CHG_ENA);
467	wm8350_reg_lock(wm8350);
468	}
469
470	return ret;
471
472	usb_failed:
473	power_supply_unregister(battery);
474	battery_failed:
475	power_supply_unregister(ac);
476
477	return ret;
478	}
479
480	static __devexit int wm8350_power_remove(struct platform_device *pdev)
481	{
482	struct wm8350 *wm8350 = platform_get_drvdata(pdev);
483	struct wm8350_power *power = &wm8350->power;
484
485	free_charger_irq(wm8350);
486	device_remove_file(&pdev->dev, &dev_attr_charger_state);
487	power_supply_unregister(&power->battery);
488	power_supply_unregister(&power->ac);
489	power_supply_unregister(&power->usb);
490	return 0;
491	}
492
493	static struct platform_driver wm8350_power_driver = {
494	.probe = wm8350_power_probe,
495	.remove = __devexit_p(wm8350_power_remove),
496	.driver = {
497	.name = "wm8350-power",
498	},
499	};
500
501	static int __init wm8350_power_init(void)
502	{
503	return platform_driver_register(&wm8350_power_driver);
504	}
505	module_init(wm8350_power_init);
506
507	static void __exit wm8350_power_exit(void)
508	{
509	platform_driver_unregister(&wm8350_power_driver);
510	}
511	module_exit(wm8350_power_exit);
512
513	MODULE_LICENSE("GPL");
514	MODULE_DESCRIPTION("Power supply driver for WM8350");
515	MODULE_ALIAS("platform:wm8350-power");