/*
* PMU driver for Wolfson Microelectronics wm831x PMICs
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* 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/slab.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/auxadc.h>
#include <linux/mfd/wm831x/pmu.h>
#include <linux/mfd/wm831x/pdata.h>
struct wm831x_power {
struct wm831x *wm831x;
struct power_supply wall;
struct power_supply usb;
struct power_supply battery;
};
static int wm831x_power_check_online(struct wm831x *wm831x, int supply,
union power_supply_propval *val)
{
int ret;
ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
if (ret < 0)
return ret;
if (ret & supply)
val->intval = 1;
else
val->intval = 0;
return 0;
}
static int wm831x_power_read_voltage(struct wm831x *wm831x,
enum wm831x_auxadc src,
union power_supply_propval *val)
{
int ret;
ret = wm831x_auxadc_read_uv(wm831x, src);
if (ret >= 0)
val->intval = ret;
return ret;
}
/*********************************************************************
* WALL Power
*********************************************************************/
static int wm831x_wall_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
struct wm831x *wm831x = wm831x_power->wm831x;
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
ret = wm831x_power_check_online(wm831x, WM831X_PWR_WALL, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_WALL, val);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static enum power_supply_property wm831x_wall_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
};
/*********************************************************************
* USB Power
*********************************************************************/
static int wm831x_usb_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
struct wm831x *wm831x = wm831x_power->wm831x;
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_ONLINE:
ret = wm831x_power_check_online(wm831x, WM831X_PWR_USB, val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_USB, val);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static enum power_supply_property wm831x_usb_props[] = {
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
};
/*********************************************************************
* Battery properties
*********************************************************************/
struct chg_map {
int val;
int reg_val;
};
static struct chg_map trickle_ilims[] = {
{ 50, 0 << WM831X_CHG_TRKL_ILIM_SHIFT },
{ 100, 1 << WM831X_CHG_TRKL_ILIM_SHIFT },
{ 150, 2 << WM831X_CHG_TRKL_ILIM_SHIFT },
{ 200, 3 << WM831X_CHG_TRKL_ILIM_SHIFT },
};
static struct chg_map vsels[] = {
{ 4050, 0 << WM831X_CHG_VSEL_SHIFT },
{ 4100, 1 << WM831X_CHG_VSEL_SHIFT },
{ 4150, 2 << WM831X_CHG_VSEL_SHIFT },
{ 4200, 3 << WM831X_CHG_VSEL_SHIFT },
};
static struct chg_map fast_ilims[] = {
{ 0, 0 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 50, 1 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 100, 2 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 150, 3 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 200, 4 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 250, 5 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 300, 6 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 350, 7 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 400, 8 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 450, 9 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 500, 10 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 600, 11 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 700, 12 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 800, 13 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 900, 14 << WM831X_CHG_FAST_ILIM_SHIFT },
{ 1000, 15 << WM831X_CHG_FAST_ILIM_SHIFT },
};
static struct chg_map eoc_iterms[] = {
{ 20, 0 << WM831X_CHG_ITERM_SHIFT },
{ 30, 1 << WM831X_CHG_ITERM_SHIFT },
{ 40, 2 << WM831X_CHG_ITERM_SHIFT },
{ 50, 3 << WM831X_CHG_ITERM_SHIFT },
{ 60, 4 << WM831X_CHG_ITERM_SHIFT },
{ 70, 5 << WM831X_CHG_ITERM_SHIFT },
{ 80, 6 << WM831X_CHG_ITERM_SHIFT },
{ 90, 7 << WM831X_CHG_ITERM_SHIFT },
};
static struct chg_map chg_times[] = {
{ 60, 0 << WM831X_CHG_TIME_SHIFT },
{ 90, 1 << WM831X_CHG_TIME_SHIFT },
{ 120, 2 << WM831X_CHG_TIME_SHIFT },
{ 150, 3 << WM831X_CHG_TIME_SHIFT },
{ 180, 4 << WM831X_CHG_TIME_SHIFT },
{ 210, 5 << WM831X_CHG_TIME_SHIFT },
{ 240, 6 << WM831X_CHG_TIME_SHIFT },
{ 270, 7 << WM831X_CHG_TIME_SHIFT },
{ 300, 8 << WM831X_CHG_TIME_SHIFT },
{ 330, 9 << WM831X_CHG_TIME_SHIFT },
{ 360, 10 << WM831X_CHG_TIME_SHIFT },
{ 390, 11 << WM831X_CHG_TIME_SHIFT },
{ 420, 12 << WM831X_CHG_TIME_SHIFT },
{ 450, 13 << WM831X_CHG_TIME_SHIFT },
{ 480, 14 << WM831X_CHG_TIME_SHIFT },
{ 510, 15 << WM831X_CHG_TIME_SHIFT },
};
static void wm831x_battey_apply_config(struct wm831x *wm831x,
struct chg_map *map, int count, int val,
int *reg, const char *name,
const char *units)
{
int i;
for (i = 0; i < count; i++)
if (val == map[i].val)
break;
if (i == count) {
dev_err(wm831x->dev, "Invalid %s %d%s\n",
name, val, units);
} else {
*reg |= map[i].reg_val;
dev_dbg(wm831x->dev, "Set %s of %d%s\n", name, val, units);
}
}
static void wm831x_config_battery(struct wm831x *wm831x)
{
struct wm831x_pdata *wm831x_pdata = wm831x->dev->platform_data;
struct wm831x_battery_pdata *pdata;
int ret, reg1, reg2;
if (!wm831x_pdata || !wm831x_pdata->battery) {
dev_warn(wm831x->dev,
"No battery charger configuration\n");
return;
}
pdata = wm831x_pdata->battery;
reg1 = 0;
reg2 = 0;
if (!pdata->enable) {
dev_info(wm831x->dev, "Battery charger disabled\n");
return;
}
reg1 |= WM831X_CHG_ENA;
if (pdata->off_mask)
reg2 |= WM831X_CHG_OFF_MSK;
if (pdata->fast_enable)
reg1 |= WM831X_CHG_FAST;
wm831x_battey_apply_config(wm831x, trickle_ilims,
ARRAY_SIZE(trickle_ilims),
pdata->trickle_ilim, ®2,
"trickle charge current limit", "mA");
wm831x_battey_apply_config(wm831x, vsels, ARRAY_SIZE(vsels),
pdata->vsel, ®2,
"target voltage", "mV");
wm831x_battey_apply_config(wm831x, fast_ilims, ARRAY_SIZE(fast_ilims),
pdata->fast_ilim, ®2,
"fast charge current limit", "mA");
wm831x_battey_apply_config(wm831x, eoc_iterms, ARRAY_SIZE(eoc_iterms),
pdata->eoc_iterm, ®1,
"end of charge current threshold", "mA");
wm831x_battey_apply_config(wm831x, chg_times, ARRAY_SIZE(chg_times),
pdata->timeout, ®2,
"charger timeout", "min");
ret = wm831x_reg_unlock(wm831x);
if (ret != 0) {
dev_err(wm831x->dev, "Failed to unlock registers: %d\n", ret);
return;
}
ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_1,
WM831X_CHG_ENA_MASK |
WM831X_CHG_FAST_MASK |
WM831X_CHG_ITERM_MASK,
reg1);
if (ret != 0)
dev_err(wm831x->dev, "Failed to set charger control 1: %d\n",
ret);
ret = wm831x_set_bits(wm831x, WM831X_CHARGER_CONTROL_2,
WM831X_CHG_OFF_MSK |
WM831X_CHG_TIME_MASK |
WM831X_CHG_FAST_ILIM_MASK |
WM831X_CHG_TRKL_ILIM_MASK |
WM831X_CHG_VSEL_MASK,
reg2);
if (ret != 0)
dev_err(wm831x->dev, "Failed to set charger control 2: %d\n",
ret);
wm831x_reg_lock(wm831x);
}
static int wm831x_bat_check_status(struct wm831x *wm831x, int *status)
{
int ret;
ret = wm831x_reg_read(wm831x, WM831X_SYSTEM_STATUS);
if (ret < 0)
return ret;
if (ret & WM831X_PWR_SRC_BATT) {
*status = POWER_SUPPLY_STATUS_DISCHARGING;
return 0;
}
ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
if (ret < 0)
return ret;
switch (ret & WM831X_CHG_STATE_MASK) {
case WM831X_CHG_STATE_OFF:
*status = POWER_SUPPLY_STATUS_NOT_CHARGING;
break;
case WM831X_CHG_STATE_TRICKLE:
case WM831X_CHG_STATE_FAST:
*status = POWER_SUPPLY_STATUS_CHARGING;
break;
default:
*status = POWER_SUPPLY_STATUS_UNKNOWN;
break;
}
return 0;
}
static int wm831x_bat_check_type(struct wm831x *wm831x, int *type)
{
int ret;
ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
if (ret < 0)
return ret;
switch (ret & WM831X_CHG_STATE_MASK) {
case WM831X_CHG_STATE_TRICKLE:
case WM831X_CHG_STATE_TRICKLE_OT:
*type = POWER_SUPPLY_CHARGE_TYPE_TRICKLE;
break;
case WM831X_CHG_STATE_FAST:
case WM831X_CHG_STATE_FAST_OT:
*type = POWER_SUPPLY_CHARGE_TYPE_FAST;
break;
default:
*type = POWER_SUPPLY_CHARGE_TYPE_NONE;
break;
}
return 0;
}
static int wm831x_bat_check_health(struct wm831x *wm831x, int *health)
{
int ret;
ret = wm831x_reg_read(wm831x, WM831X_CHARGER_STATUS);
if (ret < 0)
return ret;
if (ret & WM831X_BATT_HOT_STS) {
*health = POWER_SUPPLY_HEALTH_OVERHEAT;
return 0;
}
if (ret & WM831X_BATT_COLD_STS) {
*health = POWER_SUPPLY_HEALTH_COLD;
return 0;
}
if (ret & WM831X_BATT_OV_STS) {
*health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
return 0;
}
switch (ret & WM831X_CHG_STATE_MASK) {
case WM831X_CHG_STATE_TRICKLE_OT:
case WM831X_CHG_STATE_FAST_OT:
*health = POWER_SUPPLY_HEALTH_OVERHEAT;
break;
case WM831X_CHG_STATE_DEFECTIVE:
*health = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
break;
default:
*health = POWER_SUPPLY_HEALTH_GOOD;
break;
}
return 0;
}
static int wm831x_bat_get_prop(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct wm831x_power *wm831x_power = dev_get_drvdata(psy->dev->parent);
struct wm831x *wm831x = wm831x_power->wm831x;
int ret = 0;
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
ret = wm831x_bat_check_status(wm831x, &val->intval);
break;
case POWER_SUPPLY_PROP_ONLINE:
ret = wm831x_power_check_online(wm831x, WM831X_PWR_SRC_BATT,
val);
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = wm831x_power_read_voltage(wm831x, WM831X_AUX_BATT, val);
break;
case POWER_SUPPLY_PROP_HEALTH:
ret = wm831x_bat_check_health(wm831x, &val->intval);
break;
case POWER_SUPPLY_PROP_CHARGE_TYPE:
ret = wm831x_bat_check_type(wm831x, &val->intval);
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static enum power_supply_property wm831x_bat_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CHARGE_TYPE,
};
static const char *wm831x_bat_irqs[] = {
"BATT HOT",
"BATT COLD",
"BATT FAIL",
"OV",
"END",
"TO",
"MODE",
"START",
};
static irqreturn_t wm831x_bat_irq(int irq, void *data)
{
struct wm831x_power *wm831x_power = data;
struct wm831x *wm831x = wm831x_power->wm831x;
dev_dbg(wm831x->dev, "Battery status changed: %d\n", irq);
/* The battery charger is autonomous so we don't need to do
* anything except kick user space */
power_supply_changed(&wm831x_power->battery);
return IRQ_HANDLED;
}
/*********************************************************************
* Initialisation
*********************************************************************/
static irqreturn_t wm831x_syslo_irq(int irq, void *data)
{
struct wm831x_power *wm831x_power = data;
struct wm831x *wm831x = wm831x_power->wm831x;
/* Not much we can actually *do* but tell people for
* posterity, we're probably about to run out of power. */
dev_crit(wm831x->dev, "SYSVDD under voltage\n");
return IRQ_HANDLED;
}
static irqreturn_t wm831x_pwr_src_irq(int irq, void *data)
{
struct wm831x_power *wm831x_power = data;
struct wm831x *wm831x = wm831x_power->wm831x;
dev_dbg(wm831x->dev, "Power source changed\n");
/* Just notify for everything - little harm in overnotifying. */
power_supply_changed(&wm831x_power->battery);
power_supply_changed(&wm831x_power->usb);
power_supply_changed(&wm831x_power->wall);
return IRQ_HANDLED;
}
static __devinit int wm831x_power_probe(struct platform_device *pdev)
{
struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
struct wm831x_power *power;
struct power_supply *usb;
struct power_supply *battery;
struct power_supply *wall;
int ret, irq, i;
power = kzalloc(sizeof(struct wm831x_power), GFP_KERNEL);
if (power == NULL)
return -ENOMEM;
power->wm831x = wm831x;
platform_set_drvdata(pdev, power);
usb = &power->usb;
battery = &power->battery;
wall = &power->wall;
/* We ignore configuration failures since we can still read back
* the status without enabling the charger.
*/
wm831x_config_battery(wm831x);
wall->name = "wm831x-wall";
wall->type = POWER_SUPPLY_TYPE_MAINS;
wall->properties = wm831x_wall_props;
wall->num_properties = ARRAY_SIZE(wm831x_wall_props);
wall->get_property = wm831x_wall_get_prop;
ret = power_supply_register(&pdev->dev, wall);
if (ret)
goto err_kmalloc;
battery->name = "wm831x-battery";
battery->properties = wm831x_bat_props;
battery->num_properties = ARRAY_SIZE(wm831x_bat_props);
battery->get_property = wm831x_bat_get_prop;
battery->use_for_apm = 1;
ret = power_supply_register(&pdev->dev, battery);
if (ret)
goto err_wall;
usb->name = "wm831x-usb",
usb->type = POWER_SUPPLY_TYPE_USB;
usb->properties = wm831x_usb_props;
usb->num_properties = ARRAY_SIZE(wm831x_usb_props);
usb->get_property = wm831x_usb_get_prop;
ret = power_supply_register(&pdev->dev, usb);
if (ret)
goto err_battery;
irq = platform_get_irq_byname(pdev, "SYSLO");
ret = request_threaded_irq(irq, NULL, wm831x_syslo_irq,
IRQF_TRIGGER_RISING, "System power low",
power);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request SYSLO IRQ %d: %d\n",
irq, ret);
goto err_usb;
}
irq = platform_get_irq_byname(pdev, "PWR SRC");
ret = request_threaded_irq(irq, NULL, wm831x_pwr_src_irq,
IRQF_TRIGGER_RISING, "Power source",
power);
if (ret != 0) {
dev_err(&pdev->dev, "Failed to request PWR SRC IRQ %d: %d\n",
irq, ret);
goto err_syslo;
}
for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
ret = request_threaded_irq(irq, NULL, wm831x_bat_irq,
IRQF_TRIGGER_RISING,
wm831x_bat_irqs[i],
power);
if (ret != 0) {
dev_err(&pdev->dev,
"Failed to request %s IRQ %d: %d\n",
wm831x_bat_irqs[i], irq, ret);
goto err_bat_irq;
}
}
return ret;
err_bat_irq:
for (; i >= 0; i--) {
irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
free_irq(irq, power);
}
irq = platform_get_irq_byname(pdev, "PWR SRC");
free_irq(irq, power);
err_syslo:
irq = platform_get_irq_byname(pdev, "SYSLO");
free_irq(irq, power);
err_usb:
power_supply_unregister(usb);
err_battery:
power_supply_unregister(battery);
err_wall:
power_supply_unregister(wall);
err_kmalloc:
kfree(power);
return ret;
}
static __devexit int wm831x_power_remove(struct platform_device *pdev)
{
struct wm831x_power *wm831x_power = platform_get_drvdata(pdev);
int irq, i;
for (i = 0; i < ARRAY_SIZE(wm831x_bat_irqs); i++) {
irq = platform_get_irq_byname(pdev, wm831x_bat_irqs[i]);
free_irq(irq, wm831x_power);
}
irq = platform_get_irq_byname(pdev, "PWR SRC");
free_irq(irq, wm831x_power);
irq = platform_get_irq_byname(pdev, "SYSLO");
free_irq(irq, wm831x_power);
power_supply_unregister(&wm831x_power->battery);
power_supply_unregister(&wm831x_power->wall);
power_supply_unregister(&wm831x_power->usb);
kfree(wm831x_power);
return 0;
}
static struct platform_driver wm831x_power_driver = {
.probe = wm831x_power_probe,
.remove = __devexit_p(wm831x_power_remove),
.driver = {
.name = "wm831x-power",
},
};
static int __init wm831x_power_init(void)
{
return platform_driver_register(&wm831x_power_driver);
}
module_init(wm831x_power_init);
static void __exit wm831x_power_exit(void)
{
platform_driver_unregister(&wm831x_power_driver);
}
module_exit(wm831x_power_exit);
MODULE_DESCRIPTION("Power supply driver for WM831x PMICs");
MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:wm831x-power");
