/*
* 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 irqreturn_t wm8350_charger_handler(int irq, void *data)
{
struct wm8350 *wm8350 = data;
struct wm8350_power *power = &wm8350->power;
struct wm8350_charger_policy *policy = power->policy;
switch (irq - wm8350->irq_base) {
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");
power_supply_changed(&power->battery);
break;
case WM8350_IRQ_CHG_BAT_HOT:
case WM8350_IRQ_CHG_BAT_COLD:
case WM8350_IRQ_CHG_START:
case WM8350_IRQ_CHG_END:
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);
}
return IRQ_HANDLED;
}
/*********************************************************************
* 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_check_health(struct wm8350 *wm8350)
{
u16 reg;
if (wm8350_read_battery_uvolts(wm8350) < 2850000)
return POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
reg = wm8350_reg_read(wm8350, WM8350_CHARGER_OVERRIDES);
if (reg & WM8350_CHG_BATT_HOT_OVRDE)
return POWER_SUPPLY_HEALTH_OVERHEAT;
if (reg & WM8350_CHG_BATT_COLD_OVRDE)
return POWER_SUPPLY_HEALTH_COLD;
return POWER_SUPPLY_HEALTH_GOOD;
}
static int wm8350_bat_get_charge_type(struct wm8350 *wm8350)
{
int state;
state = wm8350_reg_read(wm8350, WM8350_BATTERY_CHARGER_CONTROL_2) &
WM8350_CHG_STS_MASK;
switch (state) {
case WM8350_CHG_STS_OFF:
return POWER_SUPPLY_CHARGE_TYPE_NONE;
case WM8350_CHG_STS_TRICKLE:
return POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
case WM8350_CHG_STS_FAST:
return POWER_SUPPLY_CHARGE_TYPE_FAST;
default:
return POWER_SUPPLY_CHARGE_TYPE_UNKNOWN;
}
}
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;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = wm8350_bat_check_health(wm8350);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
val->intval = wm8350_bat_get_charge_type(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,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CHARGE_TYPE,
};
/*********************************************************************
* 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, 0, "Battery hot", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD,
wm8350_charger_handler, 0, "Battery cold", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL,
wm8350_charger_handler, 0, "Battery fail", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_TO,
wm8350_charger_handler, 0,
"Charger timeout", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_END,
wm8350_charger_handler, 0,
"Charge end", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_START,
wm8350_charger_handler, 0,
"Charge start", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_FAST_RDY,
wm8350_charger_handler, 0,
"Fast charge ready", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9,
wm8350_charger_handler, 0,
"Battery <3.9V", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1,
wm8350_charger_handler, 0,
"Battery <3.1V", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85,
wm8350_charger_handler, 0,
"Battery <2.85V", wm8350);
/* and supply change events */
wm8350_register_irq(wm8350, WM8350_IRQ_EXT_USB_FB,
wm8350_charger_handler, 0, "USB", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_EXT_WALL_FB,
wm8350_charger_handler, 0, "Wall", wm8350);
wm8350_register_irq(wm8350, WM8350_IRQ_EXT_BAT_FB,
wm8350_charger_handler, 0, "Battery", wm8350);
}
static void free_charger_irq(struct wm8350 *wm8350)
{
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_HOT, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_FB, wm8350);
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_BAT_FB, wm8350);
}
static 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 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 = wm8350_power_remove,
.driver = {
.name = "wm8350-power",
},
};
module_platform_driver(wm8350_power_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Power supply driver for WM8350");
MODULE_ALIAS("platform:wm8350-power");
