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linux/drivers/power/wm8350_power.c
Mark Brown 6a6127462e mfd: Mask and unmask wm8350 IRQs on request and free 
Bring the WM8350 IRQ API more in line with the generic IRQ API by
masking and unmasking interrupts as they are requested and freed.
This is mostly just a case of deleting the mask and unmask calls
from the individual drivers.

The RTC driver is changed to mask the periodic IRQ after requesting
it rather than only unmasking the alarm IRQ. If the periodic IRQ
fires in the period where it is reqested then there will be a
spurious notification but there should be no serious consequences
from this.

The CODEC drive is changed to explicitly disable headphone jack
detection prior to requesting the IRQs. This will avoid the IRQ
firing with no jack set up.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:21:40 +01:00

540 lines
15 KiB
C
Raw Blame History

/*
* 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) {
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_free_irq(wm8350, WM8350_IRQ_CHG_BAT_COLD);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_BAT_FAIL);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_TO);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_END);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_START);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P9);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_3P1);
wm8350_free_irq(wm8350, WM8350_IRQ_CHG_VBATT_LT_2P85);
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_USB_FB);
wm8350_free_irq(wm8350, WM8350_IRQ_EXT_WALL_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");
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