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linux/drivers/power/intel_mid_battery.c

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/*
* intel_mid_battery.c - Intel MID PMIC Battery Driver
*
* Copyright (C) 2009 Intel Corporation
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* Author: Nithish Mahalingam <nithish.mahalingam@intel.com>
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/jiffies.h>
#include <linux/param.h>
#include <linux/device.h>
#include <linux/spi/spi.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <asm/intel_scu_ipc.h>
#define DRIVER_NAME "pmic_battery"
/*********************************************************************
* Generic defines
*********************************************************************/
static int debug;
module_param(debug, int, 0444);
MODULE_PARM_DESC(debug, "Flag to enable PMIC Battery debug messages.");
#define PMIC_BATT_DRV_INFO_UPDATED 1
#define PMIC_BATT_PRESENT 1
#define PMIC_BATT_NOT_PRESENT 0
#define PMIC_USB_PRESENT PMIC_BATT_PRESENT
#define PMIC_USB_NOT_PRESENT PMIC_BATT_NOT_PRESENT
/* pmic battery register related */
#define PMIC_BATT_CHR_SCHRGINT_ADDR 0xD2
#define PMIC_BATT_CHR_SBATOVP_MASK (1 << 1)
#define PMIC_BATT_CHR_STEMP_MASK (1 << 2)
#define PMIC_BATT_CHR_SCOMP_MASK (1 << 3)
#define PMIC_BATT_CHR_SUSBDET_MASK (1 << 4)
#define PMIC_BATT_CHR_SBATDET_MASK (1 << 5)
#define PMIC_BATT_CHR_SDCLMT_MASK (1 << 6)
#define PMIC_BATT_CHR_SUSBOVP_MASK (1 << 7)
#define PMIC_BATT_CHR_EXCPT_MASK 0x86
#define PMIC_BATT_ADC_ACCCHRG_MASK (1 << 31)
#define PMIC_BATT_ADC_ACCCHRGVAL_MASK 0x7FFFFFFF
/* pmic ipc related */
#define PMIC_BATT_CHR_IPC_FCHRG_SUBID 0x4
#define PMIC_BATT_CHR_IPC_TCHRG_SUBID 0x6
/* types of battery charging */
enum batt_charge_type {
BATT_USBOTG_500MA_CHARGE,
BATT_USBOTG_TRICKLE_CHARGE,
};
/* valid battery events */
enum batt_event {
BATT_EVENT_BATOVP_EXCPT,
BATT_EVENT_USBOVP_EXCPT,
BATT_EVENT_TEMP_EXCPT,
BATT_EVENT_DCLMT_EXCPT,
BATT_EVENT_EXCPT
};
/*********************************************************************
* Battery properties
*********************************************************************/
/*
* pmic battery info
*/
struct pmic_power_module_info {
bool is_dev_info_updated;
struct device *dev;
/* pmic battery data */
unsigned long update_time; /* jiffies when data read */
unsigned int usb_is_present;
unsigned int batt_is_present;
unsigned int batt_health;
unsigned int usb_health;
unsigned int batt_status;
unsigned int batt_charge_now; /* in mAS */
unsigned int batt_prev_charge_full; /* in mAS */
unsigned int batt_charge_rate; /* in units per second */
struct power_supply usb;
struct power_supply batt;
int irq; /* GPE_ID or IRQ# */
struct workqueue_struct *monitor_wqueue;
struct delayed_work monitor_battery;
struct work_struct handler;
};
static unsigned int delay_time = 2000; /* in ms */
/*
* pmic ac properties
*/
static enum power_supply_property pmic_usb_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_HEALTH,
};
/*
* pmic battery properties
*/
static enum power_supply_property pmic_battery_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_CHARGE_NOW,
POWER_SUPPLY_PROP_CHARGE_FULL,
};
/*
* Glue functions for talking to the IPC
*/
struct battery_property {
u32 capacity; /* Charger capacity */
u8 crnt; /* Quick charge current value*/
u8 volt; /* Fine adjustment of constant charge voltage */
u8 prot; /* CHRGPROT register value */
u8 prot2; /* CHRGPROT1 register value */
u8 timer; /* Charging timer */
};
#define IPCMSG_BATTERY 0xEF
/* Battery coulomb counter accumulator commands */
#define IPC_CMD_CC_WR 0 /* Update coulomb counter value */
#define IPC_CMD_CC_RD 1 /* Read coulomb counter value */
#define IPC_CMD_BATTERY_PROPERTY 2 /* Read Battery property */
/**
* pmic_scu_ipc_battery_cc_read - read battery cc
* @value: battery coulomb counter read
*
* Reads the battery couloumb counter value, returns 0 on success, or
* an error code
*
* This function may sleep. Locking for SCU accesses is handled for
* the caller.
*/
static int pmic_scu_ipc_battery_cc_read(u32 *value)
{
return intel_scu_ipc_command(IPCMSG_BATTERY, IPC_CMD_CC_RD,
NULL, 0, value, 1);
}
/**
* pmic_scu_ipc_battery_property_get - fetch properties
* @prop: battery properties
*
* Retrieve the battery properties from the power management
*
* This function may sleep. Locking for SCU accesses is handled for
* the caller.
*/
static int pmic_scu_ipc_battery_property_get(struct battery_property *prop)
{
u32 data[3];
u8 *p = (u8 *)&data[1];
int err = intel_scu_ipc_command(IPCMSG_BATTERY,
IPC_CMD_BATTERY_PROPERTY, NULL, 0, data, 3);
prop->capacity = data[0];
prop->crnt = *p++;
prop->volt = *p++;
prop->prot = *p++;
prop->prot2 = *p++;
prop->timer = *p++;
return err;
}
/**
* pmic_scu_ipc_set_charger - set charger
* @charger: charger to select
*
* Switch the charging mode for the SCU
*/
static int pmic_scu_ipc_set_charger(int charger)
{
return intel_scu_ipc_simple_command(IPCMSG_BATTERY, charger);
}
/**
* pmic_battery_log_event - log battery events
* @event: battery event to be logged
* Context: can sleep
*
* There are multiple battery events which may be of interest to users;
* this battery function logs the different battery events onto the
* kernel log messages.
*/
static void pmic_battery_log_event(enum batt_event event)
{
printk(KERN_WARNING "pmic-battery: ");
switch (event) {
case BATT_EVENT_BATOVP_EXCPT:
printk(KERN_CONT "battery overvoltage condition\n");
break;
case BATT_EVENT_USBOVP_EXCPT:
printk(KERN_CONT "usb charger overvoltage condition\n");
break;
case BATT_EVENT_TEMP_EXCPT:
printk(KERN_CONT "high battery temperature condition\n");
break;
case BATT_EVENT_DCLMT_EXCPT:
printk(KERN_CONT "over battery charge current condition\n");
break;
default:
printk(KERN_CONT "charger/battery exception %d\n", event);
break;
}
}
/**
* pmic_battery_read_status - read battery status information
* @pbi: device info structure to update the read information
* Context: can sleep
*
* PMIC power source information need to be updated based on the data read
* from the PMIC battery registers.
*
*/
static void pmic_battery_read_status(struct pmic_power_module_info *pbi)
{
unsigned int update_time_intrvl;
unsigned int chrg_val;
u32 ccval;
u8 r8;
struct battery_property batt_prop;
int batt_present = 0;
int usb_present = 0;
int batt_exception = 0;
/* make sure the last batt_status read happened delay_time before */
if (pbi->update_time && time_before(jiffies, pbi->update_time +
msecs_to_jiffies(delay_time)))
return;
update_time_intrvl = jiffies_to_msecs(jiffies - pbi->update_time);
pbi->update_time = jiffies;
/* read coulomb counter registers and schrgint register */
if (pmic_scu_ipc_battery_cc_read(&ccval)) {
dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
__func__);
return;
}
if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
__func__);
return;
}
/*
* set pmic_power_module_info members based on pmic register values
* read.
*/
/* set batt_is_present */
if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
pbi->batt_is_present = PMIC_BATT_PRESENT;
batt_present = 1;
} else {
pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
}
/* set batt_health */
if (batt_present) {
if (r8 & PMIC_BATT_CHR_SBATOVP_MASK) {
pbi->batt_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
pmic_battery_log_event(BATT_EVENT_BATOVP_EXCPT);
batt_exception = 1;
} else if (r8 & PMIC_BATT_CHR_STEMP_MASK) {
pbi->batt_health = POWER_SUPPLY_HEALTH_OVERHEAT;
pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
pmic_battery_log_event(BATT_EVENT_TEMP_EXCPT);
batt_exception = 1;
} else {
pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
if (r8 & PMIC_BATT_CHR_SDCLMT_MASK) {
/* PMIC will change charging current automatically */
pmic_battery_log_event(BATT_EVENT_DCLMT_EXCPT);
}
}
}
/* set usb_is_present */
if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
pbi->usb_is_present = PMIC_USB_PRESENT;
usb_present = 1;
} else {
pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
}
if (usb_present) {
if (r8 & PMIC_BATT_CHR_SUSBOVP_MASK) {
pbi->usb_health = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
pmic_battery_log_event(BATT_EVENT_USBOVP_EXCPT);
} else {
pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
}
}
chrg_val = ccval & PMIC_BATT_ADC_ACCCHRGVAL_MASK;
/* set batt_prev_charge_full to battery capacity the first time */
if (!pbi->is_dev_info_updated) {
if (pmic_scu_ipc_battery_property_get(&batt_prop)) {
dev_warn(pbi->dev, "%s(): ipc config cmd failed\n",
__func__);
return;
}
pbi->batt_prev_charge_full = batt_prop.capacity;
}
/* set batt_status */
if (batt_present && !batt_exception) {
if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
pbi->batt_prev_charge_full = chrg_val;
} else if (ccval & PMIC_BATT_ADC_ACCCHRG_MASK) {
pbi->batt_status = POWER_SUPPLY_STATUS_DISCHARGING;
} else {
pbi->batt_status = POWER_SUPPLY_STATUS_CHARGING;
}
}
/* set batt_charge_rate */
if (pbi->is_dev_info_updated && batt_present && !batt_exception) {
if (pbi->batt_status == POWER_SUPPLY_STATUS_DISCHARGING) {
if (pbi->batt_charge_now - chrg_val) {
pbi->batt_charge_rate = ((pbi->batt_charge_now -
chrg_val) * 1000 * 60) /
update_time_intrvl;
}
} else if (pbi->batt_status == POWER_SUPPLY_STATUS_CHARGING) {
if (chrg_val - pbi->batt_charge_now) {
pbi->batt_charge_rate = ((chrg_val -
pbi->batt_charge_now) * 1000 * 60) /
update_time_intrvl;
}
} else
pbi->batt_charge_rate = 0;
} else {
pbi->batt_charge_rate = -1;
}
/* batt_charge_now */
if (batt_present && !batt_exception)
pbi->batt_charge_now = chrg_val;
else
pbi->batt_charge_now = -1;
pbi->is_dev_info_updated = PMIC_BATT_DRV_INFO_UPDATED;
}
/**
* pmic_usb_get_property - usb power source get property
* @psy: usb power supply context
* @psp: usb power source property
* @val: usb power source property value
* Context: can sleep
*
* PMIC usb power source property needs to be provided to power_supply
* subsytem for it to provide the information to users.
*/
static int pmic_usb_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct pmic_power_module_info *pbi = container_of(psy,
struct pmic_power_module_info, usb);
/* update pmic_power_module_info members */
pmic_battery_read_status(pbi);
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
val->intval = pbi->usb_is_present;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = pbi->usb_health;
break;
default:
return -EINVAL;
}
return 0;
}
static inline unsigned long mAStouAh(unsigned long v)
{
/* seconds to hours, mA to µA */
return (v * 1000) / 3600;
}
/**
* pmic_battery_get_property - battery power source get property
* @psy: battery power supply context
* @psp: battery power source property
* @val: battery power source property value
* Context: can sleep
*
* PMIC battery power source property needs to be provided to power_supply
* subsytem for it to provide the information to users.
*/
static int pmic_battery_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct pmic_power_module_info *pbi = container_of(psy,
struct pmic_power_module_info, batt);
/* update pmic_power_module_info members */
pmic_battery_read_status(pbi);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = pbi->batt_status;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = pbi->batt_health;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = pbi->batt_is_present;
break;
case POWER_SUPPLY_PROP_CHARGE_NOW:
val->intval = mAStouAh(pbi->batt_charge_now);
break;
case POWER_SUPPLY_PROP_CHARGE_FULL:
val->intval = mAStouAh(pbi->batt_prev_charge_full);
break;
default:
return -EINVAL;
}
return 0;
}
/**
* pmic_battery_monitor - monitor battery status
* @work: work structure
* Context: can sleep
*
* PMIC battery status needs to be monitored for any change
* and information needs to be frequently updated.
*/
static void pmic_battery_monitor(struct work_struct *work)
{
struct pmic_power_module_info *pbi = container_of(work,
struct pmic_power_module_info, monitor_battery.work);
/* update pmic_power_module_info members */
pmic_battery_read_status(pbi);
queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 10);
}
/**
* pmic_battery_set_charger - set battery charger
* @pbi: device info structure
* @chrg: charge mode to set battery charger in
* Context: can sleep
*
* PMIC battery charger needs to be enabled based on the usb charge
* capabilities connected to the platform.
*/
static int pmic_battery_set_charger(struct pmic_power_module_info *pbi,
enum batt_charge_type chrg)
{
int retval;
/* set usblmt bits and chrgcntl register bits appropriately */
switch (chrg) {
case BATT_USBOTG_500MA_CHARGE:
retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_FCHRG_SUBID);
break;
case BATT_USBOTG_TRICKLE_CHARGE:
retval = pmic_scu_ipc_set_charger(PMIC_BATT_CHR_IPC_TCHRG_SUBID);
break;
default:
dev_warn(pbi->dev, "%s(): out of range usb charger "
"charge detected\n", __func__);
return -EINVAL;
}
if (retval) {
dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
__func__);
return retval;
}
return 0;
}
/**
* pmic_battery_interrupt_handler - pmic battery interrupt handler
* Context: interrupt context
*
* PMIC battery interrupt handler which will be called with either
* battery full condition occurs or usb otg & battery connect
* condition occurs.
*/
static irqreturn_t pmic_battery_interrupt_handler(int id, void *dev)
{
struct pmic_power_module_info *pbi = dev;
schedule_work(&pbi->handler);
return IRQ_HANDLED;
}
/**
* pmic_battery_handle_intrpt - pmic battery service interrupt
* @work: work structure
* Context: can sleep
*
* PMIC battery needs to either update the battery status as full
* if it detects battery full condition caused the interrupt or needs
* to enable battery charger if it detects usb and battery detect
* caused the source of interrupt.
*/
static void pmic_battery_handle_intrpt(struct work_struct *work)
{
struct pmic_power_module_info *pbi = container_of(work,
struct pmic_power_module_info, handler);
enum batt_charge_type chrg;
u8 r8;
if (intel_scu_ipc_ioread8(PMIC_BATT_CHR_SCHRGINT_ADDR, &r8)) {
dev_warn(pbi->dev, "%s(): ipc pmic read failed\n",
__func__);
return;
}
/* find the cause of the interrupt */
if (r8 & PMIC_BATT_CHR_SBATDET_MASK) {
pbi->batt_is_present = PMIC_BATT_PRESENT;
} else {
pbi->batt_is_present = PMIC_BATT_NOT_PRESENT;
pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
pbi->batt_status = POWER_SUPPLY_STATUS_UNKNOWN;
return;
}
if (r8 & PMIC_BATT_CHR_EXCPT_MASK) {
pbi->batt_health = POWER_SUPPLY_HEALTH_UNKNOWN;
pbi->batt_status = POWER_SUPPLY_STATUS_NOT_CHARGING;
pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
pmic_battery_log_event(BATT_EVENT_EXCPT);
return;
} else {
pbi->batt_health = POWER_SUPPLY_HEALTH_GOOD;
pbi->usb_health = POWER_SUPPLY_HEALTH_GOOD;
}
if (r8 & PMIC_BATT_CHR_SCOMP_MASK) {
u32 ccval;
pbi->batt_status = POWER_SUPPLY_STATUS_FULL;
if (pmic_scu_ipc_battery_cc_read(&ccval)) {
dev_warn(pbi->dev, "%s(): ipc config cmd "
"failed\n", __func__);
return;
}
pbi->batt_prev_charge_full = ccval &
PMIC_BATT_ADC_ACCCHRGVAL_MASK;
return;
}
if (r8 & PMIC_BATT_CHR_SUSBDET_MASK) {
pbi->usb_is_present = PMIC_USB_PRESENT;
} else {
pbi->usb_is_present = PMIC_USB_NOT_PRESENT;
pbi->usb_health = POWER_SUPPLY_HEALTH_UNKNOWN;
return;
}
/* setup battery charging */
#if 0
/* check usb otg power capability and set charger accordingly */
retval = langwell_udc_maxpower(&power);
if (retval) {
dev_warn(pbi->dev,
"%s(): usb otg power query failed with error code %d\n",
__func__, retval);
return;
}
if (power >= 500)
chrg = BATT_USBOTG_500MA_CHARGE;
else
#endif
chrg = BATT_USBOTG_TRICKLE_CHARGE;
/* enable battery charging */
if (pmic_battery_set_charger(pbi, chrg)) {
dev_warn(pbi->dev,
"%s(): failed to set up battery charging\n", __func__);
return;
}
dev_dbg(pbi->dev,
"pmic-battery: %s() - setting up battery charger successful\n",
__func__);
}
/**
* pmic_battery_probe - pmic battery initialize
* @irq: pmic battery device irq
* @dev: pmic battery device structure
* Context: can sleep
*
* PMIC battery initializes its internal data structue and other
* infrastructure components for it to work as expected.
*/
static __devinit int probe(int irq, struct device *dev)
{
int retval = 0;
struct pmic_power_module_info *pbi;
dev_dbg(dev, "pmic-battery: found pmic battery device\n");
pbi = kzalloc(sizeof(*pbi), GFP_KERNEL);
if (!pbi) {
dev_err(dev, "%s(): memory allocation failed\n",
__func__);
return -ENOMEM;
}
pbi->dev = dev;
pbi->irq = irq;
dev_set_drvdata(dev, pbi);
/* initialize all required framework before enabling interrupts */
INIT_WORK(&pbi->handler, pmic_battery_handle_intrpt);
INIT_DELAYED_WORK(&pbi->monitor_battery, pmic_battery_monitor);
pbi->monitor_wqueue =
create_singlethread_workqueue(dev_name(dev));
if (!pbi->monitor_wqueue) {
dev_err(dev, "%s(): wqueue init failed\n", __func__);
retval = -ESRCH;
goto wqueue_failed;
}
/* register interrupt */
retval = request_irq(pbi->irq, pmic_battery_interrupt_handler,
0, DRIVER_NAME, pbi);
if (retval) {
dev_err(dev, "%s(): cannot get IRQ\n", __func__);
goto requestirq_failed;
}
/* register pmic-batt with power supply subsystem */
pbi->batt.name = "pmic-batt";
pbi->batt.type = POWER_SUPPLY_TYPE_BATTERY;
pbi->batt.properties = pmic_battery_props;
pbi->batt.num_properties = ARRAY_SIZE(pmic_battery_props);
pbi->batt.get_property = pmic_battery_get_property;
retval = power_supply_register(dev, &pbi->batt);
if (retval) {
dev_err(dev,
"%s(): failed to register pmic battery device with power supply subsystem\n",
__func__);
goto power_reg_failed;
}
dev_dbg(dev, "pmic-battery: %s() - pmic battery device "
"registration with power supply subsystem successful\n",
__func__);
queue_delayed_work(pbi->monitor_wqueue, &pbi->monitor_battery, HZ * 1);
/* register pmic-usb with power supply subsystem */
pbi->usb.name = "pmic-usb";
pbi->usb.type = POWER_SUPPLY_TYPE_USB;
pbi->usb.properties = pmic_usb_props;
pbi->usb.num_properties = ARRAY_SIZE(pmic_usb_props);
pbi->usb.get_property = pmic_usb_get_property;
retval = power_supply_register(dev, &pbi->usb);
if (retval) {
dev_err(dev,
"%s(): failed to register pmic usb device with power supply subsystem\n",
__func__);
goto power_reg_failed_1;
}
if (debug)
printk(KERN_INFO "pmic-battery: %s() - pmic usb device "
"registration with power supply subsystem successful\n",
__func__);
return retval;
power_reg_failed_1:
power_supply_unregister(&pbi->batt);
power_reg_failed:
cancel_delayed_work_sync(&pbi->monitor_battery);
requestirq_failed:
destroy_workqueue(pbi->monitor_wqueue);
wqueue_failed:
kfree(pbi);
return retval;
}
static int __devinit platform_pmic_battery_probe(struct platform_device *pdev)
{
return probe(pdev->id, &pdev->dev);
}
/**
* pmic_battery_remove - pmic battery finalize
* @dev: pmic battery device structure
* Context: can sleep
*
* PMIC battery finalizes its internal data structue and other
* infrastructure components that it initialized in
* pmic_battery_probe.
*/
static int __devexit platform_pmic_battery_remove(struct platform_device *pdev)
{
struct pmic_power_module_info *pbi = dev_get_drvdata(&pdev->dev);
free_irq(pbi->irq, pbi);
cancel_delayed_work_sync(&pbi->monitor_battery);
destroy_workqueue(pbi->monitor_wqueue);
power_supply_unregister(&pbi->usb);
power_supply_unregister(&pbi->batt);
cancel_work_sync(&pbi->handler);
kfree(pbi);
return 0;
}
static struct platform_driver platform_pmic_battery_driver = {
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
.probe = platform_pmic_battery_probe,
.remove = __devexit_p(platform_pmic_battery_remove),
};
module_platform_driver(platform_pmic_battery_driver);
MODULE_AUTHOR("Nithish Mahalingam <nithish.mahalingam@intel.com>");
MODULE_DESCRIPTION("Intel Moorestown PMIC Battery Driver");
MODULE_LICENSE("GPL");
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