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kernel-ark/drivers/power/ab8500_charger.c
Paer-Olof Haakansson 34c11a709e u8500-charger: Delay for USB enumeration 
If charging is started before USB enumeration of an Accessory
Charger Adapter has finished, the AB8500 will generate a
VBUS_ERROR. This in turn results in timeouts and delays the
enumeration with around 15 seconds. This patch delays the
charging and then ramps currents slowly to avoid VBUS errors.
The delay allows the enumeration to have finished before
charging is turned on.

Signed-off-by: Martin Sjoblom <martin.w.sjoblom@stericsson.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>
Tested-by: Jonas ABERG <jonas.aberg@stericsson.com>
2013-01-23 14:39:22 +00:00

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/*
* Copyright (C) ST-Ericsson SA 2012
*
* Charger driver for AB8500
*
* License Terms: GNU General Public License v2
* Author:
* Johan Palsson <johan.palsson@stericsson.com>
* Karl Komierowski <karl.komierowski@stericsson.com>
* Arun R Murthy <arun.murthy@stericsson.com>
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/completion.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/of.h>
#include <linux/mfd/core.h>
#include <linux/mfd/abx500/ab8500.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/abx500/ab8500-bm.h>
#include <linux/mfd/abx500/ab8500-gpadc.h>
#include <linux/mfd/abx500/ux500_chargalg.h>
#include <linux/usb/otg.h>
#include <linux/mutex.h>
/* Charger constants */
#define NO_PW_CONN 0
#define AC_PW_CONN 1
#define USB_PW_CONN 2
#define MAIN_WDOG_ENA 0x01
#define MAIN_WDOG_KICK 0x02
#define MAIN_WDOG_DIS 0x00
#define CHARG_WD_KICK 0x01
#define MAIN_CH_ENA 0x01
#define MAIN_CH_NO_OVERSHOOT_ENA_N 0x02
#define USB_CH_ENA 0x01
#define USB_CHG_NO_OVERSHOOT_ENA_N 0x02
#define MAIN_CH_DET 0x01
#define MAIN_CH_CV_ON 0x04
#define USB_CH_CV_ON 0x08
#define VBUS_DET_DBNC100 0x02
#define VBUS_DET_DBNC1 0x01
#define OTP_ENABLE_WD 0x01
#define MAIN_CH_INPUT_CURR_SHIFT 4
#define VBUS_IN_CURR_LIM_SHIFT 4
#define AUTO_VBUS_IN_CURR_LIM_SHIFT 4
#define LED_INDICATOR_PWM_ENA 0x01
#define LED_INDICATOR_PWM_DIS 0x00
#define LED_IND_CUR_5MA 0x04
#define LED_INDICATOR_PWM_DUTY_252_256 0xBF
/* HW failure constants */
#define MAIN_CH_TH_PROT 0x02
#define VBUS_CH_NOK 0x08
#define USB_CH_TH_PROT 0x02
#define VBUS_OVV_TH 0x01
#define MAIN_CH_NOK 0x01
#define VBUS_DET 0x80
#define MAIN_CH_STATUS2_MAINCHGDROP 0x80
#define MAIN_CH_STATUS2_MAINCHARGERDETDBNC 0x40
#define USB_CH_VBUSDROP 0x40
#define USB_CH_VBUSDETDBNC 0x01
/* UsbLineStatus register bit masks */
#define AB8500_USB_LINK_STATUS 0x78
#define AB8500_STD_HOST_SUSP 0x18
/* Watchdog timeout constant */
#define WD_TIMER 0x30 /* 4min */
#define WD_KICK_INTERVAL (60 * HZ)
/* Lowest charger voltage is 3.39V -> 0x4E */
#define LOW_VOLT_REG 0x4E
/* Step up/down delay in us */
#define STEP_UDELAY 1000
#define CHARGER_STATUS_POLL 10 /* in ms */
#define CHG_WD_INTERVAL (60 * HZ)
#define AB8500_SW_CONTROL_FALLBACK 0x03
/* Wait for enumeration before charing in us */
#define WAIT_ACA_RID_ENUMERATION (5 * 1000)
/* UsbLineStatus register - usb types */
enum ab8500_charger_link_status {
USB_STAT_NOT_CONFIGURED,
USB_STAT_STD_HOST_NC,
USB_STAT_STD_HOST_C_NS,
USB_STAT_STD_HOST_C_S,
USB_STAT_HOST_CHG_NM,
USB_STAT_HOST_CHG_HS,
USB_STAT_HOST_CHG_HS_CHIRP,
USB_STAT_DEDICATED_CHG,
USB_STAT_ACA_RID_A,
USB_STAT_ACA_RID_B,
USB_STAT_ACA_RID_C_NM,
USB_STAT_ACA_RID_C_HS,
USB_STAT_ACA_RID_C_HS_CHIRP,
USB_STAT_HM_IDGND,
USB_STAT_RESERVED,
USB_STAT_NOT_VALID_LINK,
USB_STAT_PHY_EN,
USB_STAT_SUP_NO_IDGND_VBUS,
USB_STAT_SUP_IDGND_VBUS,
USB_STAT_CHARGER_LINE_1,
USB_STAT_CARKIT_1,
USB_STAT_CARKIT_2,
USB_STAT_ACA_DOCK_CHARGER,
};
enum ab8500_usb_state {
AB8500_BM_USB_STATE_RESET_HS, /* HighSpeed Reset */
AB8500_BM_USB_STATE_RESET_FS, /* FullSpeed/LowSpeed Reset */
AB8500_BM_USB_STATE_CONFIGURED,
AB8500_BM_USB_STATE_SUSPEND,
AB8500_BM_USB_STATE_RESUME,
AB8500_BM_USB_STATE_MAX,
};
/* VBUS input current limits supported in AB8500 in mA */
#define USB_CH_IP_CUR_LVL_0P05 50
#define USB_CH_IP_CUR_LVL_0P09 98
#define USB_CH_IP_CUR_LVL_0P19 193
#define USB_CH_IP_CUR_LVL_0P29 290
#define USB_CH_IP_CUR_LVL_0P38 380
#define USB_CH_IP_CUR_LVL_0P45 450
#define USB_CH_IP_CUR_LVL_0P5 500
#define USB_CH_IP_CUR_LVL_0P6 600
#define USB_CH_IP_CUR_LVL_0P7 700
#define USB_CH_IP_CUR_LVL_0P8 800
#define USB_CH_IP_CUR_LVL_0P9 900
#define USB_CH_IP_CUR_LVL_1P0 1000
#define USB_CH_IP_CUR_LVL_1P1 1100
#define USB_CH_IP_CUR_LVL_1P3 1300
#define USB_CH_IP_CUR_LVL_1P4 1400
#define USB_CH_IP_CUR_LVL_1P5 1500
#define VBAT_TRESH_IP_CUR_RED 3800
#define to_ab8500_charger_usb_device_info(x) container_of((x), \
struct ab8500_charger, usb_chg)
#define to_ab8500_charger_ac_device_info(x) container_of((x), \
struct ab8500_charger, ac_chg)
/**
* struct ab8500_charger_interrupts - ab8500 interupts
* @name: name of the interrupt
* @isr function pointer to the isr
*/
struct ab8500_charger_interrupts {
char *name;
irqreturn_t (*isr)(int irq, void *data);
};
struct ab8500_charger_info {
int charger_connected;
int charger_online;
int charger_voltage;
int cv_active;
bool wd_expired;
int charger_current;
};
struct ab8500_charger_event_flags {
bool mainextchnotok;
bool main_thermal_prot;
bool usb_thermal_prot;
bool vbus_ovv;
bool usbchargernotok;
bool chgwdexp;
bool vbus_collapse;
bool vbus_drop_end;
};
struct ab8500_charger_usb_state {
int usb_current;
int usb_current_tmp;
enum ab8500_usb_state state;
enum ab8500_usb_state state_tmp;
spinlock_t usb_lock;
};
/**
* struct ab8500_charger - ab8500 Charger device information
* @dev: Pointer to the structure device
* @max_usb_in_curr: Max USB charger input current
* @vbus_detected: VBUS detected
* @vbus_detected_start:
* VBUS detected during startup
* @ac_conn: This will be true when the AC charger has been plugged
* @vddadc_en_ac: Indicate if VDD ADC supply is enabled because AC
* charger is enabled
* @vddadc_en_usb: Indicate if VDD ADC supply is enabled because USB
* charger is enabled
* @vbat Battery voltage
* @old_vbat Previously measured battery voltage
* @usb_device_is_unrecognised USB device is unrecognised by the hardware
* @autopower Indicate if we should have automatic pwron after pwrloss
* @autopower_cfg platform specific power config support for "pwron after pwrloss"
* @invalid_charger_detect_state State when forcing AB to use invalid charger
* @is_usb_host: Indicate if last detected USB type is host
* @is_aca_rid: Incicate if accessory is ACA type
* @current_stepping_sessions:
* Counter for current stepping sessions
* @parent: Pointer to the struct ab8500
* @gpadc: Pointer to the struct gpadc
* @bm: Platform specific battery management information
* @flags: Structure for information about events triggered
* @usb_state: Structure for usb stack information
* @ac_chg: AC charger power supply
* @usb_chg: USB charger power supply
* @ac: Structure that holds the AC charger properties
* @usb: Structure that holds the USB charger properties
* @regu: Pointer to the struct regulator
* @charger_wq: Work queue for the IRQs and checking HW state
* @usb_ipt_crnt_lock: Lock to protect VBUS input current setting from mutuals
* @pm_lock: Lock to prevent system to suspend
* @check_vbat_work Work for checking vbat threshold to adjust vbus current
* @check_hw_failure_work: Work for checking HW state
* @check_usbchgnotok_work: Work for checking USB charger not ok status
* @kick_wd_work: Work for kicking the charger watchdog in case
* of ABB rev 1.* due to the watchog logic bug
* @ac_charger_attached_work: Work for checking if AC charger is still
* connected
* @usb_charger_attached_work: Work for checking if USB charger is still
* connected
* @ac_work: Work for checking AC charger connection
* @detect_usb_type_work: Work for detecting the USB type connected
* @usb_link_status_work: Work for checking the new USB link status
* @usb_state_changed_work: Work for checking USB state
* @attach_work: Work for detecting USB type
* @vbus_drop_end_work: Work for detecting VBUS drop end
* @check_main_thermal_prot_work:
* Work for checking Main thermal status
* @check_usb_thermal_prot_work:
* Work for checking USB thermal status
* @charger_attached_mutex: For controlling the wakelock
*/
struct ab8500_charger {
struct device *dev;
int max_usb_in_curr;
bool vbus_detected;
bool vbus_detected_start;
bool ac_conn;
bool vddadc_en_ac;
bool vddadc_en_usb;
int vbat;
int old_vbat;
bool usb_device_is_unrecognised;
bool autopower;
bool autopower_cfg;
int invalid_charger_detect_state;
bool is_usb_host;
int is_aca_rid;
atomic_t current_stepping_sessions;
struct ab8500 *parent;
struct ab8500_gpadc *gpadc;
struct abx500_bm_data *bm;
struct ab8500_charger_event_flags flags;
struct ab8500_charger_usb_state usb_state;
struct ux500_charger ac_chg;
struct ux500_charger usb_chg;
struct ab8500_charger_info ac;
struct ab8500_charger_info usb;
struct regulator *regu;
struct workqueue_struct *charger_wq;
struct mutex usb_ipt_crnt_lock;
struct delayed_work check_vbat_work;
struct delayed_work check_hw_failure_work;
struct delayed_work check_usbchgnotok_work;
struct delayed_work kick_wd_work;
struct delayed_work usb_state_changed_work;
struct delayed_work attach_work;
struct delayed_work ac_charger_attached_work;
struct delayed_work usb_charger_attached_work;
struct delayed_work vbus_drop_end_work;
struct work_struct ac_work;
struct work_struct detect_usb_type_work;
struct work_struct usb_link_status_work;
struct work_struct check_main_thermal_prot_work;
struct work_struct check_usb_thermal_prot_work;
struct usb_phy *usb_phy;
struct notifier_block nb;
struct mutex charger_attached_mutex;
};
/* AC properties */
static enum power_supply_property ab8500_charger_ac_props[] = {
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
/* USB properties */
static enum power_supply_property ab8500_charger_usb_props[] = {
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CURRENT_AVG,
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_VOLTAGE_AVG,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
/*
* Function for enabling and disabling sw fallback mode
* should always be disabled when no charger is connected.
*/
static void ab8500_enable_disable_sw_fallback(struct ab8500_charger *di,
bool fallback)
{
u8 val;
u8 reg;
u8 bank;
u8 bit;
int ret;
dev_dbg(di->dev, "SW Fallback: %d\n", fallback);
if (is_ab8500(di->parent)) {
bank = 0x15;
reg = 0x0;
bit = 3;
} else {
bank = AB8500_SYS_CTRL1_BLOCK;
reg = AB8500_SW_CONTROL_FALLBACK;
bit = 0;
}
/* read the register containing fallback bit */
ret = abx500_get_register_interruptible(di->dev, bank, reg, &val);
if (ret < 0) {
dev_err(di->dev, "%d read failed\n", __LINE__);
return;
}
if (is_ab8500(di->parent)) {
/* enable the OPT emulation registers */
ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x2);
if (ret) {
dev_err(di->dev, "%d write failed\n", __LINE__);
goto disable_otp;
}
}
if (fallback)
val |= (1 << bit);
else
val &= ~(1 << bit);
/* write back the changed fallback bit value to register */
ret = abx500_set_register_interruptible(di->dev, bank, reg, val);
if (ret) {
dev_err(di->dev, "%d write failed\n", __LINE__);
}
disable_otp:
if (is_ab8500(di->parent)) {
/* disable the set OTP registers again */
ret = abx500_set_register_interruptible(di->dev, 0x11, 0x00, 0x0);
if (ret) {
dev_err(di->dev, "%d write failed\n", __LINE__);
}
}
}
/**
* ab8500_power_supply_changed - a wrapper with local extentions for
* power_supply_changed
* @di: pointer to the ab8500_charger structure
* @psy: pointer to power_supply_that have changed.
*
*/
static void ab8500_power_supply_changed(struct ab8500_charger *di,
struct power_supply *psy)
{
if (di->autopower_cfg) {
if (!di->usb.charger_connected &&
!di->ac.charger_connected &&
di->autopower) {
di->autopower = false;
ab8500_enable_disable_sw_fallback(di, false);
} else if (!di->autopower &&
(di->ac.charger_connected ||
di->usb.charger_connected)) {
di->autopower = true;
ab8500_enable_disable_sw_fallback(di, true);
}
}
power_supply_changed(psy);
}
static void ab8500_charger_set_usb_connected(struct ab8500_charger *di,
bool connected)
{
if (connected != di->usb.charger_connected) {
dev_dbg(di->dev, "USB connected:%i\n", connected);
di->usb.charger_connected = connected;
sysfs_notify(&di->usb_chg.psy.dev->kobj, NULL, "present");
if (connected) {
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
queue_delayed_work(di->charger_wq,
&di->usb_charger_attached_work,
HZ);
} else {
cancel_delayed_work_sync(&di->usb_charger_attached_work);
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
}
}
}
/**
* ab8500_charger_get_ac_voltage() - get ac charger voltage
* @di: pointer to the ab8500_charger structure
*
* Returns ac charger voltage (on success)
*/
static int ab8500_charger_get_ac_voltage(struct ab8500_charger *di)
{
int vch;
/* Only measure voltage if the charger is connected */
if (di->ac.charger_connected) {
vch = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_V);
if (vch < 0)
dev_err(di->dev, "%s gpadc conv failed,\n", __func__);
} else {
vch = 0;
}
return vch;
}
/**
* ab8500_charger_ac_cv() - check if the main charger is in CV mode
* @di: pointer to the ab8500_charger structure
*
* Returns ac charger CV mode (on success) else error code
*/
static int ab8500_charger_ac_cv(struct ab8500_charger *di)
{
u8 val;
int ret = 0;
/* Only check CV mode if the charger is online */
if (di->ac.charger_online) {
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_STATUS1_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return 0;
}
if (val & MAIN_CH_CV_ON)
ret = 1;
else
ret = 0;
}
return ret;
}
/**
* ab8500_charger_get_vbus_voltage() - get vbus voltage
* @di: pointer to the ab8500_charger structure
*
* This function returns the vbus voltage.
* Returns vbus voltage (on success)
*/
static int ab8500_charger_get_vbus_voltage(struct ab8500_charger *di)
{
int vch;
/* Only measure voltage if the charger is connected */
if (di->usb.charger_connected) {
vch = ab8500_gpadc_convert(di->gpadc, VBUS_V);
if (vch < 0)
dev_err(di->dev, "%s gpadc conv failed\n", __func__);
} else {
vch = 0;
}
return vch;
}
/**
* ab8500_charger_get_usb_current() - get usb charger current
* @di: pointer to the ab8500_charger structure
*
* This function returns the usb charger current.
* Returns usb current (on success) and error code on failure
*/
static int ab8500_charger_get_usb_current(struct ab8500_charger *di)
{
int ich;
/* Only measure current if the charger is online */
if (di->usb.charger_online) {
ich = ab8500_gpadc_convert(di->gpadc, USB_CHARGER_C);
if (ich < 0)
dev_err(di->dev, "%s gpadc conv failed\n", __func__);
} else {
ich = 0;
}
return ich;
}
/**
* ab8500_charger_get_ac_current() - get ac charger current
* @di: pointer to the ab8500_charger structure
*
* This function returns the ac charger current.
* Returns ac current (on success) and error code on failure.
*/
static int ab8500_charger_get_ac_current(struct ab8500_charger *di)
{
int ich;
/* Only measure current if the charger is online */
if (di->ac.charger_online) {
ich = ab8500_gpadc_convert(di->gpadc, MAIN_CHARGER_C);
if (ich < 0)
dev_err(di->dev, "%s gpadc conv failed\n", __func__);
} else {
ich = 0;
}
return ich;
}
/**
* ab8500_charger_usb_cv() - check if the usb charger is in CV mode
* @di: pointer to the ab8500_charger structure
*
* Returns ac charger CV mode (on success) else error code
*/
static int ab8500_charger_usb_cv(struct ab8500_charger *di)
{
int ret;
u8 val;
/* Only check CV mode if the charger is online */
if (di->usb.charger_online) {
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_USBCH_STAT1_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return 0;
}
if (val & USB_CH_CV_ON)
ret = 1;
else
ret = 0;
} else {
ret = 0;
}
return ret;
}
/**
* ab8500_charger_detect_chargers() - Detect the connected chargers
* @di: pointer to the ab8500_charger structure
* @probe: if probe, don't delay and wait for HW
*
* Returns the type of charger connected.
* For USB it will not mean we can actually charge from it
* but that there is a USB cable connected that we have to
* identify. This is used during startup when we don't get
* interrupts of the charger detection
*
* Returns an integer value, that means,
* NO_PW_CONN no power supply is connected
* AC_PW_CONN if the AC power supply is connected
* USB_PW_CONN if the USB power supply is connected
* AC_PW_CONN + USB_PW_CONN if USB and AC power supplies are both connected
*/
static int ab8500_charger_detect_chargers(struct ab8500_charger *di, bool probe)
{
int result = NO_PW_CONN;
int ret;
u8 val;
/* Check for AC charger */
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_STATUS1_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
if (val & MAIN_CH_DET)
result = AC_PW_CONN;
/* Check for USB charger */
if (!probe) {
/*
* AB8500 says VBUS_DET_DBNC1 & VBUS_DET_DBNC100
* when disconnecting ACA even though no
* charger was connected. Try waiting a little
* longer than the 100 ms of VBUS_DET_DBNC100...
*/
msleep(110);
}
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_USBCH_STAT1_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
dev_dbg(di->dev,
"%s AB8500_CH_USBCH_STAT1_REG %x\n", __func__,
val);
if ((val & VBUS_DET_DBNC1) && (val & VBUS_DET_DBNC100))
result |= USB_PW_CONN;
return result;
}
/**
* ab8500_charger_max_usb_curr() - get the max curr for the USB type
* @di: pointer to the ab8500_charger structure
* @link_status: the identified USB type
*
* Get the maximum current that is allowed to be drawn from the host
* based on the USB type.
* Returns error code in case of failure else 0 on success
*/
static int ab8500_charger_max_usb_curr(struct ab8500_charger *di,
enum ab8500_charger_link_status link_status)
{
int ret = 0;
di->usb_device_is_unrecognised = false;
/*
* Platform only supports USB 2.0.
* This means that charging current from USB source
* is maximum 500 mA. Every occurence of USB_STAT_*_HOST_*
* should set USB_CH_IP_CUR_LVL_0P5.
*/
switch (link_status) {
case USB_STAT_STD_HOST_NC:
case USB_STAT_STD_HOST_C_NS:
case USB_STAT_STD_HOST_C_S:
dev_dbg(di->dev, "USB Type - Standard host is "
"detected through USB driver\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
di->is_usb_host = true;
di->is_aca_rid = 0;
break;
case USB_STAT_HOST_CHG_HS_CHIRP:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
di->is_usb_host = true;
di->is_aca_rid = 0;
break;
case USB_STAT_HOST_CHG_HS:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
di->is_usb_host = true;
di->is_aca_rid = 0;
break;
case USB_STAT_ACA_RID_C_HS:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P9;
di->is_usb_host = false;
di->is_aca_rid = 0;
break;
case USB_STAT_ACA_RID_A:
/*
* Dedicated charger level minus maximum current accessory
* can consume (900mA). Closest level is 500mA
*/
dev_dbg(di->dev, "USB_STAT_ACA_RID_A detected\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
di->is_usb_host = false;
di->is_aca_rid = 1;
break;
case USB_STAT_ACA_RID_B:
/*
* Dedicated charger level minus 120mA (20mA for ACA and
* 100mA for potential accessory). Closest level is 1300mA
*/
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P3;
dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
di->max_usb_in_curr);
di->is_usb_host = false;
di->is_aca_rid = 1;
break;
case USB_STAT_HOST_CHG_NM:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
di->is_usb_host = true;
di->is_aca_rid = 0;
break;
case USB_STAT_DEDICATED_CHG:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
di->is_usb_host = false;
di->is_aca_rid = 0;
break;
case USB_STAT_ACA_RID_C_HS_CHIRP:
case USB_STAT_ACA_RID_C_NM:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
di->is_usb_host = false;
di->is_aca_rid = 1;
break;
case USB_STAT_NOT_CONFIGURED:
if (di->vbus_detected) {
di->usb_device_is_unrecognised = true;
dev_dbg(di->dev, "USB Type - Legacy charger.\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_1P5;
break;
}
case USB_STAT_HM_IDGND:
dev_err(di->dev, "USB Type - Charging not allowed\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
ret = -ENXIO;
break;
case USB_STAT_RESERVED:
if (is_ab8500(di->parent)) {
di->flags.vbus_collapse = true;
dev_err(di->dev, "USB Type - USB_STAT_RESERVED "
"VBUS has collapsed\n");
ret = -ENXIO;
break;
}
if (is_ab9540(di->parent) || is_ab8505(di->parent)) {
dev_dbg(di->dev, "USB Type - Charging not allowed\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
link_status, di->max_usb_in_curr);
ret = -ENXIO;
break;
}
break;
case USB_STAT_CARKIT_1:
case USB_STAT_CARKIT_2:
case USB_STAT_ACA_DOCK_CHARGER:
case USB_STAT_CHARGER_LINE_1:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d", link_status,
di->max_usb_in_curr);
case USB_STAT_NOT_VALID_LINK:
dev_err(di->dev, "USB Type invalid - try charging anyway\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
break;
default:
dev_err(di->dev, "USB Type - Unknown\n");
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
ret = -ENXIO;
break;
};
dev_dbg(di->dev, "USB Type - 0x%02x MaxCurr: %d",
link_status, di->max_usb_in_curr);
return ret;
}
/**
* ab8500_charger_read_usb_type() - read the type of usb connected
* @di: pointer to the ab8500_charger structure
*
* Detect the type of the plugged USB
* Returns error code in case of failure else 0 on success
*/
static int ab8500_charger_read_usb_type(struct ab8500_charger *di)
{
int ret;
u8 val;
ret = abx500_get_register_interruptible(di->dev,
AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
if (is_ab8500(di->parent)) {
ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
AB8500_USB_LINE_STAT_REG, &val);
} else {
if (is_ab9540(di->parent) || is_ab8505(di->parent))
ret = abx500_get_register_interruptible(di->dev,
AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
}
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
/* get the USB type */
val = (val & AB8500_USB_LINK_STATUS) >> 3;
ret = ab8500_charger_max_usb_curr(di,
(enum ab8500_charger_link_status) val);
return ret;
}
/**
* ab8500_charger_detect_usb_type() - get the type of usb connected
* @di: pointer to the ab8500_charger structure
*
* Detect the type of the plugged USB
* Returns error code in case of failure else 0 on success
*/
static int ab8500_charger_detect_usb_type(struct ab8500_charger *di)
{
int i, ret;
u8 val;
/*
* On getting the VBUS rising edge detect interrupt there
* is a 250ms delay after which the register UsbLineStatus
* is filled with valid data.
*/
for (i = 0; i < 10; i++) {
msleep(250);
ret = abx500_get_register_interruptible(di->dev,
AB8500_INTERRUPT, AB8500_IT_SOURCE21_REG,
&val);
dev_dbg(di->dev, "%s AB8500_IT_SOURCE21_REG %x\n",
__func__, val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
if (is_ab8500(di->parent))
ret = abx500_get_register_interruptible(di->dev,
AB8500_USB, AB8500_USB_LINE_STAT_REG, &val);
else
ret = abx500_get_register_interruptible(di->dev,
AB8500_USB, AB8500_USB_LINK1_STAT_REG, &val);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return ret;
}
dev_dbg(di->dev, "%s AB8500_USB_LINE_STAT_REG %x\n", __func__,
val);
/*
* Until the IT source register is read the UsbLineStatus
* register is not updated, hence doing the same
* Revisit this:
*/
/* get the USB type */
val = (val & AB8500_USB_LINK_STATUS) >> 3;
if (val)
break;
}
ret = ab8500_charger_max_usb_curr(di,
(enum ab8500_charger_link_status) val);
return ret;
}
/*
* This array maps the raw hex value to charger voltage used by the AB8500
* Values taken from the UM0836
*/
static int ab8500_charger_voltage_map[] = {
3500 ,
3525 ,
3550 ,
3575 ,
3600 ,
3625 ,
3650 ,
3675 ,
3700 ,
3725 ,
3750 ,
3775 ,
3800 ,
3825 ,
3850 ,
3875 ,
3900 ,
3925 ,
3950 ,
3975 ,
4000 ,
4025 ,
4050 ,
4060 ,
4070 ,
4080 ,
4090 ,
4100 ,
4110 ,
4120 ,
4130 ,
4140 ,
4150 ,
4160 ,
4170 ,
4180 ,
4190 ,
4200 ,
4210 ,
4220 ,
4230 ,
4240 ,
4250 ,
4260 ,
4270 ,
4280 ,
4290 ,
4300 ,
4310 ,
4320 ,
4330 ,
4340 ,
4350 ,
4360 ,
4370 ,
4380 ,
4390 ,
4400 ,
4410 ,
4420 ,
4430 ,
4440 ,
4450 ,
4460 ,
4470 ,
4480 ,
4490 ,
4500 ,
4510 ,
4520 ,
4530 ,
4540 ,
4550 ,
4560 ,
4570 ,
4580 ,
4590 ,
4600 ,
};
/*
* This array maps the raw hex value to charger current used by the AB8500
* Values taken from the UM0836
*/
static int ab8500_charger_current_map[] = {
100 ,
200 ,
300 ,
400 ,
500 ,
600 ,
700 ,
800 ,
900 ,
1000 ,
1100 ,
1200 ,
1300 ,
1400 ,
1500 ,
};
/*
* This array maps the raw hex value to VBUS input current used by the AB8500
* Values taken from the UM0836
*/
static int ab8500_charger_vbus_in_curr_map[] = {
USB_CH_IP_CUR_LVL_0P05,
USB_CH_IP_CUR_LVL_0P09,
USB_CH_IP_CUR_LVL_0P19,
USB_CH_IP_CUR_LVL_0P29,
USB_CH_IP_CUR_LVL_0P38,
USB_CH_IP_CUR_LVL_0P45,
USB_CH_IP_CUR_LVL_0P5,
USB_CH_IP_CUR_LVL_0P6,
USB_CH_IP_CUR_LVL_0P7,
USB_CH_IP_CUR_LVL_0P8,
USB_CH_IP_CUR_LVL_0P9,
USB_CH_IP_CUR_LVL_1P0,
USB_CH_IP_CUR_LVL_1P1,
USB_CH_IP_CUR_LVL_1P3,
USB_CH_IP_CUR_LVL_1P4,
USB_CH_IP_CUR_LVL_1P5,
};
static int ab8500_voltage_to_regval(int voltage)
{
int i;
/* Special case for voltage below 3.5V */
if (voltage < ab8500_charger_voltage_map[0])
return LOW_VOLT_REG;
for (i = 1; i < ARRAY_SIZE(ab8500_charger_voltage_map); i++) {
if (voltage < ab8500_charger_voltage_map[i])
return i - 1;
}
/* If not last element, return error */
i = ARRAY_SIZE(ab8500_charger_voltage_map) - 1;
if (voltage == ab8500_charger_voltage_map[i])
return i;
else
return -1;
}
static int ab8500_current_to_regval(int curr)
{
int i;
if (curr < ab8500_charger_current_map[0])
return 0;
for (i = 0; i < ARRAY_SIZE(ab8500_charger_current_map); i++) {
if (curr < ab8500_charger_current_map[i])
return i - 1;
}
/* If not last element, return error */
i = ARRAY_SIZE(ab8500_charger_current_map) - 1;
if (curr == ab8500_charger_current_map[i])
return i;
else
return -1;
}
static int ab8500_vbus_in_curr_to_regval(int curr)
{
int i;
if (curr < ab8500_charger_vbus_in_curr_map[0])
return 0;
for (i = 0; i < ARRAY_SIZE(ab8500_charger_vbus_in_curr_map); i++) {
if (curr < ab8500_charger_vbus_in_curr_map[i])
return i - 1;
}
/* If not last element, return error */
i = ARRAY_SIZE(ab8500_charger_vbus_in_curr_map) - 1;
if (curr == ab8500_charger_vbus_in_curr_map[i])
return i;
else
return -1;
}
/**
* ab8500_charger_get_usb_cur() - get usb current
* @di: pointer to the ab8500_charger structre
*
* The usb stack provides the maximum current that can be drawn from
* the standard usb host. This will be in mA.
* This function converts current in mA to a value that can be written
* to the register. Returns -1 if charging is not allowed
*/
static int ab8500_charger_get_usb_cur(struct ab8500_charger *di)
{
switch (di->usb_state.usb_current) {
case 100:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P09;
break;
case 200:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P19;
break;
case 300:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P29;
break;
case 400:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P38;
break;
case 500:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P5;
break;
default:
di->max_usb_in_curr = USB_CH_IP_CUR_LVL_0P05;
return -1;
break;
};
return 0;
}
/**
* ab8500_charger_set_current() - set charger current
* @di: pointer to the ab8500_charger structure
* @ich: charger current, in mA
* @reg: select what charger register to set
*
* Set charger current.
* There is no state machine in the AB to step up/down the charger
* current to avoid dips and spikes on MAIN, VBUS and VBAT when
* charging is started. Instead we need to implement
* this charger current step-up/down here.
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_set_current(struct ab8500_charger *di,
int ich, int reg)
{
int ret = 0;
int auto_curr_index, curr_index, prev_curr_index, shift_value, i;
u8 reg_value;
u32 step_udelay;
bool no_stepping = false;
atomic_inc(&di->current_stepping_sessions);
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
reg, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s read failed\n", __func__);
goto exit_set_current;
}
switch (reg) {
case AB8500_MCH_IPT_CURLVL_REG:
shift_value = MAIN_CH_INPUT_CURR_SHIFT;
prev_curr_index = (reg_value >> shift_value);
curr_index = ab8500_current_to_regval(ich);
step_udelay = STEP_UDELAY;
if (!di->ac.charger_connected)
no_stepping = true;
break;
case AB8500_USBCH_IPT_CRNTLVL_REG:
shift_value = VBUS_IN_CURR_LIM_SHIFT;
prev_curr_index = (reg_value >> shift_value);
curr_index = ab8500_vbus_in_curr_to_regval(ich);
step_udelay = STEP_UDELAY * 100;
ret = abx500_get_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_USBCH_STAT2_REG, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s read failed\n", __func__);
goto exit_set_current;
}
auto_curr_index =
reg_value >> AUTO_VBUS_IN_CURR_LIM_SHIFT;
dev_dbg(di->dev, "%s Auto VBUS curr is %d mA\n",
__func__,
ab8500_charger_vbus_in_curr_map[auto_curr_index]);
prev_curr_index = min(prev_curr_index, auto_curr_index);
if (!di->usb.charger_connected)
no_stepping = true;
break;
case AB8500_CH_OPT_CRNTLVL_REG:
shift_value = 0;
prev_curr_index = (reg_value >> shift_value);
curr_index = ab8500_current_to_regval(ich);
step_udelay = STEP_UDELAY;
if (curr_index && (curr_index - prev_curr_index) > 1)
step_udelay *= 100;
if (!di->usb.charger_connected && !di->ac.charger_connected)
no_stepping = true;
break;
default:
dev_err(di->dev, "%s current register not valid\n", __func__);
ret = -ENXIO;
goto exit_set_current;
}
if (curr_index < 0) {
dev_err(di->dev, "requested current limit out-of-range\n");
ret = -ENXIO;
goto exit_set_current;
}
/* only update current if it's been changed */
if (prev_curr_index == curr_index) {
dev_dbg(di->dev, "%s current not changed for reg: 0x%02x\n",
__func__, reg);
ret = 0;
goto exit_set_current;
}
dev_dbg(di->dev, "%s set charger current: %d mA for reg: 0x%02x\n",
__func__, ich, reg);
if (no_stepping) {
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
reg, (u8)curr_index << shift_value);
if (ret)
dev_err(di->dev, "%s write failed\n", __func__);
} else if (prev_curr_index > curr_index) {
for (i = prev_curr_index - 1; i >= curr_index; i--) {
dev_dbg(di->dev, "curr change_1 to: %x for 0x%02x\n",
(u8) i << shift_value, reg);
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER, reg, (u8)i << shift_value);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
goto exit_set_current;
}
if (i != curr_index)
usleep_range(step_udelay, step_udelay * 2);
}
} else {
for (i = prev_curr_index + 1; i <= curr_index; i++) {
dev_dbg(di->dev, "curr change_2 to: %x for 0x%02x\n",
(u8)i << shift_value, reg);
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER, reg, (u8)i << shift_value);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
goto exit_set_current;
}
if (i != curr_index)
usleep_range(step_udelay, step_udelay * 2);
}
}
exit_set_current:
atomic_dec(&di->current_stepping_sessions);
return ret;
}
/**
* ab8500_charger_set_vbus_in_curr() - set VBUS input current limit
* @di: pointer to the ab8500_charger structure
* @ich_in: charger input current limit
*
* Sets the current that can be drawn from the USB host
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_set_vbus_in_curr(struct ab8500_charger *di,
int ich_in)
{
int min_value;
int ret;
/* We should always use to lowest current limit */
min_value = min(di->bm->chg_params->usb_curr_max, ich_in);
switch (min_value) {
case 100:
if (di->vbat < VBAT_TRESH_IP_CUR_RED)
min_value = USB_CH_IP_CUR_LVL_0P05;
break;
case 500:
if (di->vbat < VBAT_TRESH_IP_CUR_RED)
min_value = USB_CH_IP_CUR_LVL_0P45;
break;
default:
break;
}
dev_info(di->dev, "VBUS input current limit set to %d mA\n", min_value);
mutex_lock(&di->usb_ipt_crnt_lock);
ret = ab8500_charger_set_current(di, min_value,
AB8500_USBCH_IPT_CRNTLVL_REG);
mutex_unlock(&di->usb_ipt_crnt_lock);
return ret;
}
/**
* ab8500_charger_set_main_in_curr() - set main charger input current
* @di: pointer to the ab8500_charger structure
* @ich_in: input charger current, in mA
*
* Set main charger input current.
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_set_main_in_curr(struct ab8500_charger *di,
int ich_in)
{
return ab8500_charger_set_current(di, ich_in,
AB8500_MCH_IPT_CURLVL_REG);
}
/**
* ab8500_charger_set_output_curr() - set charger output current
* @di: pointer to the ab8500_charger structure
* @ich_out: output charger current, in mA
*
* Set charger output current.
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_set_output_curr(struct ab8500_charger *di,
int ich_out)
{
return ab8500_charger_set_current(di, ich_out,
AB8500_CH_OPT_CRNTLVL_REG);
}
/**
* ab8500_charger_led_en() - turn on/off chargign led
* @di: pointer to the ab8500_charger structure
* @on: flag to turn on/off the chargign led
*
* Power ON/OFF charging LED indication
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_led_en(struct ab8500_charger *di, int on)
{
int ret;
if (on) {
/* Power ON charging LED indicator, set LED current to 5mA */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_LED_INDICATOR_PWM_CTRL,
(LED_IND_CUR_5MA | LED_INDICATOR_PWM_ENA));
if (ret) {
dev_err(di->dev, "Power ON LED failed\n");
return ret;
}
/* LED indicator PWM duty cycle 252/256 */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_LED_INDICATOR_PWM_DUTY,
LED_INDICATOR_PWM_DUTY_252_256);
if (ret) {
dev_err(di->dev, "Set LED PWM duty cycle failed\n");
return ret;
}
} else {
/* Power off charging LED indicator */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_LED_INDICATOR_PWM_CTRL,
LED_INDICATOR_PWM_DIS);
if (ret) {
dev_err(di->dev, "Power-off LED failed\n");
return ret;
}
}
return ret;
}
/**
* ab8500_charger_ac_en() - enable or disable ac charging
* @di: pointer to the ab8500_charger structure
* @enable: enable/disable flag
* @vset: charging voltage
* @iset: charging current
*
* Enable/Disable AC/Mains charging and turns on/off the charging led
* respectively.
**/
static int ab8500_charger_ac_en(struct ux500_charger *charger,
int enable, int vset, int iset)
{
int ret;
int volt_index;
int curr_index;
int input_curr_index;
u8 overshoot = 0;
struct ab8500_charger *di = to_ab8500_charger_ac_device_info(charger);
if (enable) {
/* Check if AC is connected */
if (!di->ac.charger_connected) {
dev_err(di->dev, "AC charger not connected\n");
return -ENXIO;
}
/* Enable AC charging */
dev_dbg(di->dev, "Enable AC: %dmV %dmA\n", vset, iset);
/*
* Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
* will be triggered everytime we enable the VDD ADC supply.
* This will turn off charging for a short while.
* It can be avoided by having the supply on when
* there is a charger enabled. Normally the VDD ADC supply
* is enabled everytime a GPADC conversion is triggered. We will
* force it to be enabled from this driver to have
* the GPADC module independant of the AB8500 chargers
*/
if (!di->vddadc_en_ac) {
regulator_enable(di->regu);
di->vddadc_en_ac = true;
}
/* Check if the requested voltage or current is valid */
volt_index = ab8500_voltage_to_regval(vset);
curr_index = ab8500_current_to_regval(iset);
input_curr_index = ab8500_current_to_regval(
di->bm->chg_params->ac_curr_max);
if (volt_index < 0 || curr_index < 0 || input_curr_index < 0) {
dev_err(di->dev,
"Charger voltage or current too high, "
"charging not started\n");
return -ENXIO;
}
/* ChVoltLevel: maximum battery charging voltage */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
return ret;
}
/* MainChInputCurr: current that can be drawn from the charger*/
ret = ab8500_charger_set_main_in_curr(di,
di->bm->chg_params->ac_curr_max);
if (ret) {
dev_err(di->dev, "%s Failed to set MainChInputCurr\n",
__func__);
return ret;
}
/* ChOutputCurentLevel: protected output current */
ret = ab8500_charger_set_output_curr(di, iset);
if (ret) {
dev_err(di->dev, "%s "
"Failed to set ChOutputCurentLevel\n",
__func__);
return ret;
}
/* Check if VBAT overshoot control should be enabled */
if (!di->bm->enable_overshoot)
overshoot = MAIN_CH_NO_OVERSHOOT_ENA_N;
/* Enable Main Charger */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_MCH_CTRL1, MAIN_CH_ENA | overshoot);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
return ret;
}
/* Power on charging LED indication */
ret = ab8500_charger_led_en(di, true);
if (ret < 0)
dev_err(di->dev, "failed to enable LED\n");
di->ac.charger_online = 1;
} else {
/* Disable AC charging */
if (is_ab8500_1p1_or_earlier(di->parent)) {
/*
* For ABB revision 1.0 and 1.1 there is a bug in the
* watchdog logic. That means we have to continously
* kick the charger watchdog even when no charger is
* connected. This is only valid once the AC charger
* has been enabled. This is a bug that is not handled
* by the algorithm and the watchdog have to be kicked
* by the charger driver when the AC charger
* is disabled
*/
if (di->ac_conn) {
queue_delayed_work(di->charger_wq,
&di->kick_wd_work,
round_jiffies(WD_KICK_INTERVAL));
}
/*
* We can't turn off charging completely
* due to a bug in AB8500 cut1.
* If we do, charging will not start again.
* That is why we set the lowest voltage
* and current possible
*/
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_CH_VOLT_LVL_REG, CH_VOL_LVL_3P5);
if (ret) {
dev_err(di->dev,
"%s write failed\n", __func__);
return ret;
}
ret = ab8500_charger_set_output_curr(di, 0);
if (ret) {
dev_err(di->dev, "%s "
"Failed to set ChOutputCurentLevel\n",
__func__);
return ret;
}
} else {
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_MCH_CTRL1, 0);
if (ret) {
dev_err(di->dev,
"%s write failed\n", __func__);
return ret;
}
}
ret = ab8500_charger_led_en(di, false);
if (ret < 0)
dev_err(di->dev, "failed to disable LED\n");
di->ac.charger_online = 0;
di->ac.wd_expired = false;
/* Disable regulator if enabled */
if (di->vddadc_en_ac) {
regulator_disable(di->regu);
di->vddadc_en_ac = false;
}
dev_dbg(di->dev, "%s Disabled AC charging\n", __func__);
}
ab8500_power_supply_changed(di, &di->ac_chg.psy);
return ret;
}
/**
* ab8500_charger_usb_en() - enable usb charging
* @di: pointer to the ab8500_charger structure
* @enable: enable/disable flag
* @vset: charging voltage
* @ich_out: charger output current
*
* Enable/Disable USB charging and turns on/off the charging led respectively.
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_usb_en(struct ux500_charger *charger,
int enable, int vset, int ich_out)
{
int ret;
int volt_index;
int curr_index;
u8 overshoot = 0;
struct ab8500_charger *di = to_ab8500_charger_usb_device_info(charger);
if (enable) {
/* Check if USB is connected */
if (!di->usb.charger_connected) {
dev_err(di->dev, "USB charger not connected\n");
return -ENXIO;
}
/*
* Due to a bug in AB8500, BTEMP_HIGH/LOW interrupts
* will be triggered everytime we enable the VDD ADC supply.
* This will turn off charging for a short while.
* It can be avoided by having the supply on when
* there is a charger enabled. Normally the VDD ADC supply
* is enabled everytime a GPADC conversion is triggered. We will
* force it to be enabled from this driver to have
* the GPADC module independant of the AB8500 chargers
*/
if (!di->vddadc_en_usb) {
regulator_enable(di->regu);
di->vddadc_en_usb = true;
}
/* Enable USB charging */
dev_dbg(di->dev, "Enable USB: %dmV %dmA\n", vset, ich_out);
/* Check if the requested voltage or current is valid */
volt_index = ab8500_voltage_to_regval(vset);
curr_index = ab8500_current_to_regval(ich_out);
if (volt_index < 0 || curr_index < 0) {
dev_err(di->dev,
"Charger voltage or current too high, "
"charging not started\n");
return -ENXIO;
}
/* ChVoltLevel: max voltage upto which battery can be charged */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_VOLT_LVL_REG, (u8) volt_index);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
return ret;
}
/* Check if VBAT overshoot control should be enabled */
if (!di->bm->enable_overshoot)
overshoot = USB_CHG_NO_OVERSHOOT_ENA_N;
/* Enable USB Charger */
dev_dbg(di->dev,
"Enabling USB with write to AB8500_USBCH_CTRL1_REG\n");
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_USBCH_CTRL1_REG, USB_CH_ENA | overshoot);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
return ret;
}
/* If success power on charging LED indication */
ret = ab8500_charger_led_en(di, true);
if (ret < 0)
dev_err(di->dev, "failed to enable LED\n");
di->usb.charger_online = 1;
/* USBChInputCurr: current that can be drawn from the usb */
ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
if (ret) {
dev_err(di->dev, "setting USBChInputCurr failed\n");
return ret;
}
/* ChOutputCurentLevel: protected output current */
ret = ab8500_charger_set_output_curr(di, ich_out);
if (ret) {
dev_err(di->dev, "%s "
"Failed to set ChOutputCurentLevel\n",
__func__);
return ret;
}
queue_delayed_work(di->charger_wq, &di->check_vbat_work, HZ);
} else {
/* Disable USB charging */
dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_USBCH_CTRL1_REG, 0);
if (ret) {
dev_err(di->dev,
"%s write failed\n", __func__);
return ret;
}
ret = ab8500_charger_led_en(di, false);
if (ret < 0)
dev_err(di->dev, "failed to disable LED\n");
/* USBChInputCurr: current that can be drawn from the usb */
ret = ab8500_charger_set_vbus_in_curr(di, 0);
if (ret) {
dev_err(di->dev, "setting USBChInputCurr failed\n");
return ret;
}
/* ChOutputCurentLevel: protected output current */
ret = ab8500_charger_set_output_curr(di, 0);
if (ret) {
dev_err(di->dev, "%s "
"Failed to reset ChOutputCurentLevel\n",
__func__);
return ret;
}
di->usb.charger_online = 0;
di->usb.wd_expired = false;
/* Disable regulator if enabled */
if (di->vddadc_en_usb) {
regulator_disable(di->regu);
di->vddadc_en_usb = false;
}
dev_dbg(di->dev, "%s Disabled USB charging\n", __func__);
/* Cancel any pending Vbat check work */
if (delayed_work_pending(&di->check_vbat_work))
cancel_delayed_work(&di->check_vbat_work);
}
ab8500_power_supply_changed(di, &di->usb_chg.psy);
return ret;
}
/**
* ab8500_charger_watchdog_kick() - kick charger watchdog
* @di: pointer to the ab8500_charger structure
*
* Kick charger watchdog
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_watchdog_kick(struct ux500_charger *charger)
{
int ret;
struct ab8500_charger *di;
if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
di = to_ab8500_charger_ac_device_info(charger);
else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
di = to_ab8500_charger_usb_device_info(charger);
else
return -ENXIO;
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
if (ret)
dev_err(di->dev, "Failed to kick WD!\n");
return ret;
}
/**
* ab8500_charger_update_charger_current() - update charger current
* @di: pointer to the ab8500_charger structure
*
* Update the charger output current for the specified charger
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_update_charger_current(struct ux500_charger *charger,
int ich_out)
{
int ret;
struct ab8500_charger *di;
if (charger->psy.type == POWER_SUPPLY_TYPE_MAINS)
di = to_ab8500_charger_ac_device_info(charger);
else if (charger->psy.type == POWER_SUPPLY_TYPE_USB)
di = to_ab8500_charger_usb_device_info(charger);
else
return -ENXIO;
ret = ab8500_charger_set_output_curr(di, ich_out);
if (ret) {
dev_err(di->dev, "%s "
"Failed to set ChOutputCurentLevel\n",
__func__);
return ret;
}
/* Reset the main and usb drop input current measurement counter */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CHARGER_CTRL,
0x1);
if (ret) {
dev_err(di->dev, "%s write failed\n", __func__);
return ret;
}
return ret;
}
static int ab8500_charger_get_ext_psy_data(struct device *dev, void *data)
{
struct power_supply *psy;
struct power_supply *ext;
struct ab8500_charger *di;
union power_supply_propval ret;
int i, j;
bool psy_found = false;
struct ux500_charger *usb_chg;
usb_chg = (struct ux500_charger *)data;
psy = &usb_chg->psy;
di = to_ab8500_charger_usb_device_info(usb_chg);
ext = dev_get_drvdata(dev);
/* For all psy where the driver name appears in any supplied_to */
for (i = 0; i < ext->num_supplicants; i++) {
if (!strcmp(ext->supplied_to[i], psy->name))
psy_found = true;
}
if (!psy_found)
return 0;
/* Go through all properties for the psy */
for (j = 0; j < ext->num_properties; j++) {
enum power_supply_property prop;
prop = ext->properties[j];
if (ext->get_property(ext, prop, &ret))
continue;
switch (prop) {
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
switch (ext->type) {
case POWER_SUPPLY_TYPE_BATTERY:
di->vbat = ret.intval / 1000;
break;
default:
break;
}
break;
default:
break;
}
}
return 0;
}
/**
* ab8500_charger_check_vbat_work() - keep vbus current within spec
* @work pointer to the work_struct structure
*
* Due to a asic bug it is necessary to lower the input current to the vbus
* charger when charging with at some specific levels. This issue is only valid
* for below a certain battery voltage. This function makes sure that the
* the allowed current limit isn't exceeded.
*/
static void ab8500_charger_check_vbat_work(struct work_struct *work)
{
int t = 10;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_vbat_work.work);
class_for_each_device(power_supply_class, NULL,
&di->usb_chg.psy, ab8500_charger_get_ext_psy_data);
/* First run old_vbat is 0. */
if (di->old_vbat == 0)
di->old_vbat = di->vbat;
if (!((di->old_vbat <= VBAT_TRESH_IP_CUR_RED &&
di->vbat <= VBAT_TRESH_IP_CUR_RED) ||
(di->old_vbat > VBAT_TRESH_IP_CUR_RED &&
di->vbat > VBAT_TRESH_IP_CUR_RED))) {
dev_dbg(di->dev, "Vbat did cross threshold, curr: %d, new: %d,"
" old: %d\n", di->max_usb_in_curr, di->vbat,
di->old_vbat);
ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
power_supply_changed(&di->usb_chg.psy);
}
di->old_vbat = di->vbat;
/*
* No need to check the battery voltage every second when not close to
* the threshold.
*/
if (di->vbat < (VBAT_TRESH_IP_CUR_RED + 100) &&
(di->vbat > (VBAT_TRESH_IP_CUR_RED - 100)))
t = 1;
queue_delayed_work(di->charger_wq, &di->check_vbat_work, t * HZ);
}
/**
* ab8500_charger_check_hw_failure_work() - check main charger failure
* @work: pointer to the work_struct structure
*
* Work queue function for checking the main charger status
*/
static void ab8500_charger_check_hw_failure_work(struct work_struct *work)
{
int ret;
u8 reg_value;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_hw_failure_work.work);
/* Check if the status bits for HW failure is still active */
if (di->flags.mainextchnotok) {
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
if (!(reg_value & MAIN_CH_NOK)) {
di->flags.mainextchnotok = false;
ab8500_power_supply_changed(di, &di->ac_chg.psy);
}
}
if (di->flags.vbus_ovv) {
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG,
&reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
if (!(reg_value & VBUS_OVV_TH)) {
di->flags.vbus_ovv = false;
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
}
/* If we still have a failure, schedule a new check */
if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
queue_delayed_work(di->charger_wq,
&di->check_hw_failure_work, round_jiffies(HZ));
}
}
/**
* ab8500_charger_kick_watchdog_work() - kick the watchdog
* @work: pointer to the work_struct structure
*
* Work queue function for kicking the charger watchdog.
*
* For ABB revision 1.0 and 1.1 there is a bug in the watchdog
* logic. That means we have to continously kick the charger
* watchdog even when no charger is connected. This is only
* valid once the AC charger has been enabled. This is
* a bug that is not handled by the algorithm and the
* watchdog have to be kicked by the charger driver
* when the AC charger is disabled
*/
static void ab8500_charger_kick_watchdog_work(struct work_struct *work)
{
int ret;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, kick_wd_work.work);
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
if (ret)
dev_err(di->dev, "Failed to kick WD!\n");
/* Schedule a new watchdog kick */
queue_delayed_work(di->charger_wq,
&di->kick_wd_work, round_jiffies(WD_KICK_INTERVAL));
}
/**
* ab8500_charger_ac_work() - work to get and set main charger status
* @work: pointer to the work_struct structure
*
* Work queue function for checking the main charger status
*/
static void ab8500_charger_ac_work(struct work_struct *work)
{
int ret;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, ac_work);
/*
* Since we can't be sure that the events are received
* synchronously, we have the check if the main charger is
* connected by reading the status register
*/
ret = ab8500_charger_detect_chargers(di, false);
if (ret < 0)
return;
if (ret & AC_PW_CONN) {
di->ac.charger_connected = 1;
di->ac_conn = true;
} else {
di->ac.charger_connected = 0;
}
ab8500_power_supply_changed(di, &di->ac_chg.psy);
sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
}
static void ab8500_charger_usb_attached_work(struct work_struct *work)
{
struct ab8500_charger *di = container_of(work,
struct ab8500_charger,
usb_charger_attached_work.work);
int usbch = (USB_CH_VBUSDROP | USB_CH_VBUSDETDBNC);
int ret, i;
u8 statval;
for (i = 0; i < 10; i++) {
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_CH_USBCH_STAT1_REG,
&statval);
if (ret < 0) {
dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
goto reschedule;
}
if ((statval & usbch) != usbch)
goto reschedule;
msleep(CHARGER_STATUS_POLL);
}
ab8500_charger_usb_en(&di->usb_chg, 0, 0, 0);
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
return;
reschedule:
queue_delayed_work(di->charger_wq,
&di->usb_charger_attached_work,
HZ);
}
static void ab8500_charger_ac_attached_work(struct work_struct *work)
{
struct ab8500_charger *di = container_of(work,
struct ab8500_charger,
ac_charger_attached_work.work);
int mainch = (MAIN_CH_STATUS2_MAINCHGDROP |
MAIN_CH_STATUS2_MAINCHARGERDETDBNC);
int ret, i;
u8 statval;
for (i = 0; i < 10; i++) {
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_CH_STATUS2_REG,
&statval);
if (ret < 0) {
dev_err(di->dev, "ab8500 read failed %d\n", __LINE__);
goto reschedule;
}
if ((statval & mainch) != mainch)
goto reschedule;
msleep(CHARGER_STATUS_POLL);
}
ab8500_charger_ac_en(&di->ac_chg, 0, 0, 0);
queue_work(di->charger_wq, &di->ac_work);
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
return;
reschedule:
queue_delayed_work(di->charger_wq,
&di->ac_charger_attached_work,
HZ);
}
/**
* ab8500_charger_detect_usb_type_work() - work to detect USB type
* @work: Pointer to the work_struct structure
*
* Detect the type of USB plugged
*/
static void ab8500_charger_detect_usb_type_work(struct work_struct *work)
{
int ret;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, detect_usb_type_work);
/*
* Since we can't be sure that the events are received
* synchronously, we have the check if is
* connected by reading the status register
*/
ret = ab8500_charger_detect_chargers(di, false);
if (ret < 0)
return;
if (!(ret & USB_PW_CONN)) {
dev_dbg(di->dev, "%s di->vbus_detected = false\n", __func__);
di->vbus_detected = false;
ab8500_charger_set_usb_connected(di, false);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
} else {
dev_dbg(di->dev, "%s di->vbus_detected = true\n", __func__);
di->vbus_detected = true;
if (is_ab8500_1p1_or_earlier(di->parent)) {
ret = ab8500_charger_detect_usb_type(di);
if (!ret) {
ab8500_charger_set_usb_connected(di, true);
ab8500_power_supply_changed(di,
&di->usb_chg.psy);
}
} else {
/*
* For ABB cut2.0 and onwards we have an IRQ,
* USB_LINK_STATUS that will be triggered when the USB
* link status changes. The exception is USB connected
* during startup. Then we don't get a
* USB_LINK_STATUS IRQ
*/
if (di->vbus_detected_start) {
di->vbus_detected_start = false;
ret = ab8500_charger_detect_usb_type(di);
if (!ret) {
ab8500_charger_set_usb_connected(di,
true);
ab8500_power_supply_changed(di,
&di->usb_chg.psy);
}
}
}
}
}
/**
* ab8500_charger_usb_link_attach_work() - work to detect USB type
* @work: pointer to the work_struct structure
*
* Detect the type of USB plugged
*/
static void ab8500_charger_usb_link_attach_work(struct work_struct *work)
{
struct ab8500_charger *di =
container_of(work, struct ab8500_charger, attach_work.work);
int ret;
/* Update maximum input current if USB enumeration is not detected */
if (!di->usb.charger_online) {
ret = ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
if (ret)
return;
}
ab8500_charger_set_usb_connected(di, true);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
/**
* ab8500_charger_usb_link_status_work() - work to detect USB type
* @work: pointer to the work_struct structure
*
* Detect the type of USB plugged
*/
static void ab8500_charger_usb_link_status_work(struct work_struct *work)
{
int detected_chargers;
int ret;
u8 val;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, usb_link_status_work);
/*
* Since we can't be sure that the events are received
* synchronously, we have the check if is
* connected by reading the status register
*/
detected_chargers = ab8500_charger_detect_chargers(di, false);
if (detected_chargers < 0)
return;
/*
* Some chargers that breaks the USB spec is
* identified as invalid by AB8500 and it refuse
* to start the charging process. but by jumping
* thru a few hoops it can be forced to start.
*/
ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
AB8500_USB_LINE_STAT_REG, &val);
if (ret >= 0)
dev_dbg(di->dev, "UsbLineStatus register = 0x%02x\n", val);
else
dev_dbg(di->dev, "Error reading USB link status\n");
if (detected_chargers & USB_PW_CONN) {
if (((val & AB8500_USB_LINK_STATUS) >> 3) == USB_STAT_NOT_VALID_LINK &&
di->invalid_charger_detect_state == 0) {
dev_dbg(di->dev, "Invalid charger detected, state= 0\n");
/*Enable charger*/
abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_USBCH_CTRL1_REG, 0x01, 0x01);
/*Enable charger detection*/
abx500_mask_and_set_register_interruptible(di->dev, AB8500_USB,
AB8500_MCH_IPT_CURLVL_REG, 0x01, 0x01);
di->invalid_charger_detect_state = 1;
/*exit and wait for new link status interrupt.*/
return;
}
if (di->invalid_charger_detect_state == 1) {
dev_dbg(di->dev, "Invalid charger detected, state= 1\n");
/*Stop charger detection*/
abx500_mask_and_set_register_interruptible(di->dev, AB8500_USB,
AB8500_MCH_IPT_CURLVL_REG, 0x01, 0x00);
/*Check link status*/
ret = abx500_get_register_interruptible(di->dev, AB8500_USB,
AB8500_USB_LINE_STAT_REG, &val);
dev_dbg(di->dev, "USB link status= 0x%02x\n",
(val & AB8500_USB_LINK_STATUS) >> 3);
di->invalid_charger_detect_state = 2;
}
} else {
di->invalid_charger_detect_state = 0;
}
if (!(detected_chargers & USB_PW_CONN)) {
di->vbus_detected = false;
ab8500_charger_set_usb_connected(di, false);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
return;
}
dev_dbg(di->dev,"%s di->vbus_detected = true\n",__func__);
di->vbus_detected = true;
ret = ab8500_charger_read_usb_type(di);
if (ret) {
if (ret == -ENXIO) {
/* No valid charger type detected */
ab8500_charger_set_usb_connected(di, false);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
return;
}
if (di->usb_device_is_unrecognised) {
dev_dbg(di->dev,
"Potential Legacy Charger device. "
"Delay work for %d msec for USB enum "
"to finish",
WAIT_ACA_RID_ENUMERATION);
queue_delayed_work(di->charger_wq,
&di->attach_work,
msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
} else if (di->is_aca_rid == 1) {
/* Only wait once */
di->is_aca_rid++;
dev_dbg(di->dev,
"%s Wait %d msec for USB enum to finish",
__func__, WAIT_ACA_RID_ENUMERATION);
queue_delayed_work(di->charger_wq,
&di->attach_work,
msecs_to_jiffies(WAIT_ACA_RID_ENUMERATION));
} else {
queue_delayed_work(di->charger_wq,
&di->attach_work,
0);
}
}
static void ab8500_charger_usb_state_changed_work(struct work_struct *work)
{
int ret;
unsigned long flags;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, usb_state_changed_work.work);
if (!di->vbus_detected) {
dev_dbg(di->dev,
"%s !di->vbus_detected\n",
__func__);
return;
}
spin_lock_irqsave(&di->usb_state.usb_lock, flags);
di->usb_state.state = di->usb_state.state_tmp;
di->usb_state.usb_current = di->usb_state.usb_current_tmp;
spin_unlock_irqrestore(&di->usb_state.usb_lock, flags);
dev_dbg(di->dev, "%s USB state: 0x%02x mA: %d\n",
__func__, di->usb_state.state, di->usb_state.usb_current);
switch (di->usb_state.state) {
case AB8500_BM_USB_STATE_RESET_HS:
case AB8500_BM_USB_STATE_RESET_FS:
case AB8500_BM_USB_STATE_SUSPEND:
case AB8500_BM_USB_STATE_MAX:
ab8500_charger_set_usb_connected(di, false);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
break;
case AB8500_BM_USB_STATE_RESUME:
/*
* when suspend->resume there should be delay
* of 1sec for enabling charging
*/
msleep(1000);
/* Intentional fall through */
case AB8500_BM_USB_STATE_CONFIGURED:
/*
* USB is configured, enable charging with the charging
* input current obtained from USB driver
*/
if (!ab8500_charger_get_usb_cur(di)) {
/* Update maximum input current */
ret = ab8500_charger_set_vbus_in_curr(di,
di->max_usb_in_curr);
if (ret)
return;
ab8500_charger_set_usb_connected(di, true);
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
break;
default:
break;
};
}
/**
* ab8500_charger_check_usbchargernotok_work() - check USB chg not ok status
* @work: pointer to the work_struct structure
*
* Work queue function for checking the USB charger Not OK status
*/
static void ab8500_charger_check_usbchargernotok_work(struct work_struct *work)
{
int ret;
u8 reg_value;
bool prev_status;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_usbchgnotok_work.work);
/* Check if the status bit for usbchargernotok is still active */
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
prev_status = di->flags.usbchargernotok;
if (reg_value & VBUS_CH_NOK) {
di->flags.usbchargernotok = true;
/* Check again in 1sec */
queue_delayed_work(di->charger_wq,
&di->check_usbchgnotok_work, HZ);
} else {
di->flags.usbchargernotok = false;
di->flags.vbus_collapse = false;
}
if (prev_status != di->flags.usbchargernotok)
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
/**
* ab8500_charger_check_main_thermal_prot_work() - check main thermal status
* @work: pointer to the work_struct structure
*
* Work queue function for checking the Main thermal prot status
*/
static void ab8500_charger_check_main_thermal_prot_work(
struct work_struct *work)
{
int ret;
u8 reg_value;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_main_thermal_prot_work);
/* Check if the status bit for main_thermal_prot is still active */
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_STATUS2_REG, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
if (reg_value & MAIN_CH_TH_PROT)
di->flags.main_thermal_prot = true;
else
di->flags.main_thermal_prot = false;
ab8500_power_supply_changed(di, &di->ac_chg.psy);
}
/**
* ab8500_charger_check_usb_thermal_prot_work() - check usb thermal status
* @work: pointer to the work_struct structure
*
* Work queue function for checking the USB thermal prot status
*/
static void ab8500_charger_check_usb_thermal_prot_work(
struct work_struct *work)
{
int ret;
u8 reg_value;
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, check_usb_thermal_prot_work);
/* Check if the status bit for usb_thermal_prot is still active */
ret = abx500_get_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CH_USBCH_STAT2_REG, &reg_value);
if (ret < 0) {
dev_err(di->dev, "%s ab8500 read failed\n", __func__);
return;
}
if (reg_value & USB_CH_TH_PROT)
di->flags.usb_thermal_prot = true;
else
di->flags.usb_thermal_prot = false;
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
/**
* ab8500_charger_mainchunplugdet_handler() - main charger unplugged
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_mainchunplugdet_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "Main charger unplugged\n");
queue_work(di->charger_wq, &di->ac_work);
cancel_delayed_work_sync(&di->ac_charger_attached_work);
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
return IRQ_HANDLED;
}
/**
* ab8500_charger_mainchplugdet_handler() - main charger plugged
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_mainchplugdet_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "Main charger plugged\n");
queue_work(di->charger_wq, &di->ac_work);
mutex_lock(&di->charger_attached_mutex);
mutex_unlock(&di->charger_attached_mutex);
queue_delayed_work(di->charger_wq,
&di->ac_charger_attached_work,
HZ);
return IRQ_HANDLED;
}
/**
* ab8500_charger_mainextchnotok_handler() - main charger not ok
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_mainextchnotok_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "Main charger not ok\n");
di->flags.mainextchnotok = true;
ab8500_power_supply_changed(di, &di->ac_chg.psy);
/* Schedule a new HW failure check */
queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
return IRQ_HANDLED;
}
/**
* ab8500_charger_mainchthprotr_handler() - Die temp is above main charger
* thermal protection threshold
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_mainchthprotr_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev,
"Die temp above Main charger thermal protection threshold\n");
queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_mainchthprotf_handler() - Die temp is below main charger
* thermal protection threshold
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_mainchthprotf_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev,
"Die temp ok for Main charger thermal protection threshold\n");
queue_work(di->charger_wq, &di->check_main_thermal_prot_work);
return IRQ_HANDLED;
}
static void ab8500_charger_vbus_drop_end_work(struct work_struct *work)
{
struct ab8500_charger *di = container_of(work,
struct ab8500_charger, vbus_drop_end_work.work);
di->flags.vbus_drop_end = false;
/* Reset the drop counter */
abx500_set_register_interruptible(di->dev,
AB8500_CHARGER, AB8500_CHARGER_CTRL, 0x01);
if (di->usb.charger_connected)
ab8500_charger_set_vbus_in_curr(di, di->max_usb_in_curr);
}
/**
* ab8500_charger_vbusdetf_handler() - VBUS falling detected
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_vbusdetf_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
di->vbus_detected = false;
dev_dbg(di->dev, "VBUS falling detected\n");
queue_work(di->charger_wq, &di->detect_usb_type_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_vbusdetr_handler() - VBUS rising detected
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_vbusdetr_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
di->vbus_detected = true;
dev_dbg(di->dev, "VBUS rising detected\n");
queue_work(di->charger_wq, &di->detect_usb_type_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_usblinkstatus_handler() - USB link status has changed
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_usblinkstatus_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "USB link status changed\n");
queue_work(di->charger_wq, &di->usb_link_status_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_usbchthprotr_handler() - Die temp is above usb charger
* thermal protection threshold
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_usbchthprotr_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev,
"Die temp above USB charger thermal protection threshold\n");
queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_usbchthprotf_handler() - Die temp is below usb charger
* thermal protection threshold
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_usbchthprotf_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev,
"Die temp ok for USB charger thermal protection threshold\n");
queue_work(di->charger_wq, &di->check_usb_thermal_prot_work);
return IRQ_HANDLED;
}
/**
* ab8500_charger_usbchargernotokr_handler() - USB charger not ok detected
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_usbchargernotokr_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "Not allowed USB charger detected\n");
queue_delayed_work(di->charger_wq, &di->check_usbchgnotok_work, 0);
return IRQ_HANDLED;
}
/**
* ab8500_charger_chwdexp_handler() - Charger watchdog expired
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_chwdexp_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "Charger watchdog expired\n");
/*
* The charger that was online when the watchdog expired
* needs to be restarted for charging to start again
*/
if (di->ac.charger_online) {
di->ac.wd_expired = true;
ab8500_power_supply_changed(di, &di->ac_chg.psy);
}
if (di->usb.charger_online) {
di->usb.wd_expired = true;
ab8500_power_supply_changed(di, &di->usb_chg.psy);
}
return IRQ_HANDLED;
}
/**
* ab8500_charger_vbuschdropend_handler() - VBUS drop removed
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_vbuschdropend_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "VBUS charger drop ended\n");
di->flags.vbus_drop_end = true;
queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work,
round_jiffies(30 * HZ));
return IRQ_HANDLED;
}
/**
* ab8500_charger_vbusovv_handler() - VBUS overvoltage detected
* @irq: interrupt number
* @_di: pointer to the ab8500_charger structure
*
* Returns IRQ status(IRQ_HANDLED)
*/
static irqreturn_t ab8500_charger_vbusovv_handler(int irq, void *_di)
{
struct ab8500_charger *di = _di;
dev_dbg(di->dev, "VBUS overvoltage detected\n");
di->flags.vbus_ovv = true;
ab8500_power_supply_changed(di, &di->usb_chg.psy);
/* Schedule a new HW failure check */
queue_delayed_work(di->charger_wq, &di->check_hw_failure_work, 0);
return IRQ_HANDLED;
}
/**
* ab8500_charger_ac_get_property() - get the ac/mains properties
* @psy: pointer to the power_supply structure
* @psp: pointer to the power_supply_property structure
* @val: pointer to the power_supply_propval union
*
* This function gets called when an application tries to get the ac/mains
* properties by reading the sysfs files.
* AC/Mains properties are online, present and voltage.
* online: ac/mains charging is in progress or not
* present: presence of the ac/mains
* voltage: AC/Mains voltage
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_ac_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ab8500_charger *di;
int ret;
di = to_ab8500_charger_ac_device_info(psy_to_ux500_charger(psy));
switch (psp) {
case POWER_SUPPLY_PROP_HEALTH:
if (di->flags.mainextchnotok)
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
else if (di->ac.wd_expired || di->usb.wd_expired)
val->intval = POWER_SUPPLY_HEALTH_DEAD;
else if (di->flags.main_thermal_prot)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = di->ac.charger_online;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = di->ac.charger_connected;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = ab8500_charger_get_ac_voltage(di);
if (ret >= 0)
di->ac.charger_voltage = ret;
/* On error, use previous value */
val->intval = di->ac.charger_voltage * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
/*
* This property is used to indicate when CV mode is entered
* for the AC charger
*/
di->ac.cv_active = ab8500_charger_ac_cv(di);
val->intval = di->ac.cv_active;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = ab8500_charger_get_ac_current(di);
if (ret >= 0)
di->ac.charger_current = ret;
val->intval = di->ac.charger_current * 1000;
break;
default:
return -EINVAL;
}
return 0;
}
/**
* ab8500_charger_usb_get_property() - get the usb properties
* @psy: pointer to the power_supply structure
* @psp: pointer to the power_supply_property structure
* @val: pointer to the power_supply_propval union
*
* This function gets called when an application tries to get the usb
* properties by reading the sysfs files.
* USB properties are online, present and voltage.
* online: usb charging is in progress or not
* present: presence of the usb
* voltage: vbus voltage
* Returns error code in case of failure else 0(on success)
*/
static int ab8500_charger_usb_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct ab8500_charger *di;
int ret;
di = to_ab8500_charger_usb_device_info(psy_to_ux500_charger(psy));
switch (psp) {
case POWER_SUPPLY_PROP_HEALTH:
if (di->flags.usbchargernotok)
val->intval = POWER_SUPPLY_HEALTH_UNSPEC_FAILURE;
else if (di->ac.wd_expired || di->usb.wd_expired)
val->intval = POWER_SUPPLY_HEALTH_DEAD;
else if (di->flags.usb_thermal_prot)
val->intval = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (di->flags.vbus_ovv)
val->intval = POWER_SUPPLY_HEALTH_OVERVOLTAGE;
else
val->intval = POWER_SUPPLY_HEALTH_GOOD;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = di->usb.charger_online;
break;
case POWER_SUPPLY_PROP_PRESENT:
val->intval = di->usb.charger_connected;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
ret = ab8500_charger_get_vbus_voltage(di);
if (ret >= 0)
di->usb.charger_voltage = ret;
val->intval = di->usb.charger_voltage * 1000;
break;
case POWER_SUPPLY_PROP_VOLTAGE_AVG:
/*
* This property is used to indicate when CV mode is entered
* for the USB charger
*/
di->usb.cv_active = ab8500_charger_usb_cv(di);
val->intval = di->usb.cv_active;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
ret = ab8500_charger_get_usb_current(di);
if (ret >= 0)
di->usb.charger_current = ret;
val->intval = di->usb.charger_current * 1000;
break;
case POWER_SUPPLY_PROP_CURRENT_AVG:
/*
* This property is used to indicate when VBUS has collapsed
* due to too high output current from the USB charger
*/
if (di->flags.vbus_collapse)
val->intval = 1;
else
val->intval = 0;
break;
default:
return -EINVAL;
}
return 0;
}
/**
* ab8500_charger_init_hw_registers() - Set up charger related registers
* @di: pointer to the ab8500_charger structure
*
* Set up charger OVV, watchdog and maximum voltage registers as well as
* charging of the backup battery
*/
static int ab8500_charger_init_hw_registers(struct ab8500_charger *di)
{
int ret = 0;
/* Setup maximum charger current and voltage for ABB cut2.0 */
if (!is_ab8500_1p1_or_earlier(di->parent)) {
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_CH_VOLT_LVL_MAX_REG, CH_VOL_LVL_4P6);
if (ret) {
dev_err(di->dev,
"failed to set CH_VOLT_LVL_MAX_REG\n");
goto out;
}
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_CH_OPT_CRNTLVL_MAX_REG, CH_OP_CUR_LVL_1P6);
if (ret) {
dev_err(di->dev,
"failed to set CH_OPT_CRNTLVL_MAX_REG\n");
goto out;
}
}
if (is_ab9540_2p0(di->parent) || is_ab8505_2p0(di->parent))
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_USBCH_CTRL2_REG,
VBUS_AUTO_IN_CURR_LIM_ENA,
VBUS_AUTO_IN_CURR_LIM_ENA);
else
/*
* VBUS OVV set to 6.3V and enable automatic current limitation
*/
ret = abx500_set_register_interruptible(di->dev,
AB8500_CHARGER,
AB8500_USBCH_CTRL2_REG,
VBUS_OVV_SELECT_6P3V | VBUS_AUTO_IN_CURR_LIM_ENA);
if (ret) {
dev_err(di->dev,
"failed to set automatic current limitation\n");
goto out;
}
/* Enable main watchdog in OTP */
ret = abx500_set_register_interruptible(di->dev,
AB8500_OTP_EMUL, AB8500_OTP_CONF_15, OTP_ENABLE_WD);
if (ret) {
dev_err(di->dev, "failed to enable main WD in OTP\n");
goto out;
}
/* Enable main watchdog */
ret = abx500_set_register_interruptible(di->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_ENA);
if (ret) {
dev_err(di->dev, "faile to enable main watchdog\n");
goto out;
}
/*
* Due to internal synchronisation, Enable and Kick watchdog bits
* cannot be enabled in a single write.
* A minimum delay of 2*32 kHz period (62.5µs) must be inserted
* between writing Enable then Kick bits.
*/
udelay(63);
/* Kick main watchdog */
ret = abx500_set_register_interruptible(di->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WDOG_CTRL_REG,
(MAIN_WDOG_ENA | MAIN_WDOG_KICK));
if (ret) {
dev_err(di->dev, "failed to kick main watchdog\n");
goto out;
}
/* Disable main watchdog */
ret = abx500_set_register_interruptible(di->dev,
AB8500_SYS_CTRL2_BLOCK,
AB8500_MAIN_WDOG_CTRL_REG, MAIN_WDOG_DIS);
if (ret) {
dev_err(di->dev, "failed to disable main watchdog\n");
goto out;
}
/* Set watchdog timeout */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_WD_TIMER_REG, WD_TIMER);
if (ret) {
dev_err(di->dev, "failed to set charger watchdog timeout\n");
goto out;
}
/* Set charger watchdog timeout */
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CH_WD_TIMER_REG, WD_TIMER);
if (ret) {
dev_err(di->dev, "failed to set charger watchdog timeout\n");
goto out;
}
ret = ab8500_charger_led_en(di, false);
if (ret < 0) {
dev_err(di->dev, "failed to disable LED\n");
goto out;
}
/* Backup battery voltage and current */
ret = abx500_set_register_interruptible(di->dev,
AB8500_RTC,
AB8500_RTC_BACKUP_CHG_REG,
di->bm->bkup_bat_v |
di->bm->bkup_bat_i);
if (ret) {
dev_err(di->dev, "failed to setup backup battery charging\n");
goto out;
}
/* Enable backup battery charging */
abx500_mask_and_set_register_interruptible(di->dev,
AB8500_RTC, AB8500_RTC_CTRL_REG,
RTC_BUP_CH_ENA, RTC_BUP_CH_ENA);
if (ret < 0)
dev_err(di->dev, "%s mask and set failed\n", __func__);
out:
return ret;
}
/*
* ab8500 charger driver interrupts and their respective isr
*/
static struct ab8500_charger_interrupts ab8500_charger_irq[] = {
{"MAIN_CH_UNPLUG_DET", ab8500_charger_mainchunplugdet_handler},
{"MAIN_CHARGE_PLUG_DET", ab8500_charger_mainchplugdet_handler},
{"MAIN_EXT_CH_NOT_OK", ab8500_charger_mainextchnotok_handler},
{"MAIN_CH_TH_PROT_R", ab8500_charger_mainchthprotr_handler},
{"MAIN_CH_TH_PROT_F", ab8500_charger_mainchthprotf_handler},
{"VBUS_DET_F", ab8500_charger_vbusdetf_handler},
{"VBUS_DET_R", ab8500_charger_vbusdetr_handler},
{"USB_LINK_STATUS", ab8500_charger_usblinkstatus_handler},
{"USB_CH_TH_PROT_R", ab8500_charger_usbchthprotr_handler},
{"USB_CH_TH_PROT_F", ab8500_charger_usbchthprotf_handler},
{"USB_CHARGER_NOT_OKR", ab8500_charger_usbchargernotokr_handler},
{"VBUS_OVV", ab8500_charger_vbusovv_handler},
{"CH_WD_EXP", ab8500_charger_chwdexp_handler},
{"VBUS_CH_DROP_END", ab8500_charger_vbuschdropend_handler},
};
static int ab8500_charger_usb_notifier_call(struct notifier_block *nb,
unsigned long event, void *power)
{
struct ab8500_charger *di =
container_of(nb, struct ab8500_charger, nb);
enum ab8500_usb_state bm_usb_state;
unsigned mA = *((unsigned *)power);
if (!di)
return NOTIFY_DONE;
if (event != USB_EVENT_VBUS) {
dev_dbg(di->dev, "not a standard host, returning\n");
return NOTIFY_DONE;
}
/* TODO: State is fabricate here. See if charger really needs USB
* state or if mA is enough
*/
if ((di->usb_state.usb_current == 2) && (mA > 2))
bm_usb_state = AB8500_BM_USB_STATE_RESUME;
else if (mA == 0)
bm_usb_state = AB8500_BM_USB_STATE_RESET_HS;
else if (mA == 2)
bm_usb_state = AB8500_BM_USB_STATE_SUSPEND;
else if (mA >= 8) /* 8, 100, 500 */
bm_usb_state = AB8500_BM_USB_STATE_CONFIGURED;
else /* Should never occur */
bm_usb_state = AB8500_BM_USB_STATE_RESET_FS;
dev_dbg(di->dev, "%s usb_state: 0x%02x mA: %d\n",
__func__, bm_usb_state, mA);
spin_lock(&di->usb_state.usb_lock);
di->usb_state.state_tmp = bm_usb_state;
di->usb_state.usb_current_tmp = mA;
spin_unlock(&di->usb_state.usb_lock);
/*
* wait for some time until you get updates from the usb stack
* and negotiations are completed
*/
queue_delayed_work(di->charger_wq, &di->usb_state_changed_work, HZ/2);
return NOTIFY_OK;
}
#if defined(CONFIG_PM)
static int ab8500_charger_resume(struct platform_device *pdev)
{
int ret;
struct ab8500_charger *di = platform_get_drvdata(pdev);
/*
* For ABB revision 1.0 and 1.1 there is a bug in the watchdog
* logic. That means we have to continously kick the charger
* watchdog even when no charger is connected. This is only
* valid once the AC charger has been enabled. This is
* a bug that is not handled by the algorithm and the
* watchdog have to be kicked by the charger driver
* when the AC charger is disabled
*/
if (di->ac_conn && is_ab8500_1p1_or_earlier(di->parent)) {
ret = abx500_set_register_interruptible(di->dev, AB8500_CHARGER,
AB8500_CHARG_WD_CTRL, CHARG_WD_KICK);
if (ret)
dev_err(di->dev, "Failed to kick WD!\n");
/* If not already pending start a new timer */
if (!delayed_work_pending(
&di->kick_wd_work)) {
queue_delayed_work(di->charger_wq, &di->kick_wd_work,
round_jiffies(WD_KICK_INTERVAL));
}
}
/* If we still have a HW failure, schedule a new check */
if (di->flags.mainextchnotok || di->flags.vbus_ovv) {
queue_delayed_work(di->charger_wq,
&di->check_hw_failure_work, 0);
}
if (di->flags.vbus_drop_end)
queue_delayed_work(di->charger_wq, &di->vbus_drop_end_work, 0);
return 0;
}
static int ab8500_charger_suspend(struct platform_device *pdev,
pm_message_t state)
{
struct ab8500_charger *di = platform_get_drvdata(pdev);
/* Cancel any pending HW failure check */
if (delayed_work_pending(&di->check_hw_failure_work))
cancel_delayed_work(&di->check_hw_failure_work);
if (delayed_work_pending(&di->vbus_drop_end_work))
cancel_delayed_work(&di->vbus_drop_end_work);
flush_delayed_work(&di->attach_work);
flush_delayed_work(&di->usb_charger_attached_work);
flush_delayed_work(&di->ac_charger_attached_work);
flush_delayed_work(&di->check_usbchgnotok_work);
flush_delayed_work(&di->check_vbat_work);
flush_delayed_work(&di->kick_wd_work);
flush_work(&di->usb_link_status_work);
flush_work(&di->ac_work);
flush_work(&di->detect_usb_type_work);
if (atomic_read(&di->current_stepping_sessions))
return -EAGAIN;
return 0;
}
#else
#define ab8500_charger_suspend NULL
#define ab8500_charger_resume NULL
#endif
static int ab8500_charger_remove(struct platform_device *pdev)
{
struct ab8500_charger *di = platform_get_drvdata(pdev);
int i, irq, ret;
/* Disable AC charging */
ab8500_charger_ac_en(&di->ac_chg, false, 0, 0);
/* Disable USB charging */
ab8500_charger_usb_en(&di->usb_chg, false, 0, 0);
/* Disable interrupts */
for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
free_irq(irq, di);
}
/* Backup battery voltage and current disable */
ret = abx500_mask_and_set_register_interruptible(di->dev,
AB8500_RTC, AB8500_RTC_CTRL_REG, RTC_BUP_CH_ENA, 0);
if (ret < 0)
dev_err(di->dev, "%s mask and set failed\n", __func__);
usb_unregister_notifier(di->usb_phy, &di->nb);
usb_put_phy(di->usb_phy);
/* Delete the work queue */
destroy_workqueue(di->charger_wq);
flush_scheduled_work();
if(di->usb_chg.enabled)
power_supply_unregister(&di->usb_chg.psy);
#if !defined(CONFIG_CHARGER_PM2301)
if(di->ac_chg.enabled)
power_supply_unregister(&di->ac_chg.psy);
#endif
platform_set_drvdata(pdev, NULL);
return 0;
}
static char *supply_interface[] = {
"ab8500_chargalg",
"ab8500_fg",
"ab8500_btemp",
};
static int ab8500_charger_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct abx500_bm_data *plat = pdev->dev.platform_data;
struct ab8500_charger *di;
int irq, i, charger_status, ret = 0, ch_stat;
di = devm_kzalloc(&pdev->dev, sizeof(*di), GFP_KERNEL);
if (!di) {
dev_err(&pdev->dev, "%s no mem for ab8500_charger\n", __func__);
return -ENOMEM;
}
if (!plat) {
dev_err(&pdev->dev, "no battery management data supplied\n");
return -EINVAL;
}
di->bm = plat;
if (np) {
ret = ab8500_bm_of_probe(&pdev->dev, np, di->bm);
if (ret) {
dev_err(&pdev->dev, "failed to get battery information\n");
return ret;
}
di->autopower_cfg = of_property_read_bool(np, "autopower_cfg");
} else
di->autopower_cfg = false;
/* get parent data */
di->dev = &pdev->dev;
di->parent = dev_get_drvdata(pdev->dev.parent);
di->gpadc = ab8500_gpadc_get("ab8500-gpadc.0");
/* initialize lock */
spin_lock_init(&di->usb_state.usb_lock);
mutex_init(&di->usb_ipt_crnt_lock);
di->autopower = false;
di->invalid_charger_detect_state = 0;
/* AC supply */
/* power_supply base class */
di->ac_chg.psy.name = "ab8500_ac";
di->ac_chg.psy.type = POWER_SUPPLY_TYPE_MAINS;
di->ac_chg.psy.properties = ab8500_charger_ac_props;
di->ac_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_ac_props);
di->ac_chg.psy.get_property = ab8500_charger_ac_get_property;
di->ac_chg.psy.supplied_to = supply_interface;
di->ac_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
/* ux500_charger sub-class */
di->ac_chg.ops.enable = &ab8500_charger_ac_en;
di->ac_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
di->ac_chg.ops.update_curr = &ab8500_charger_update_charger_current;
di->ac_chg.max_out_volt = ab8500_charger_voltage_map[
ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
di->ac_chg.max_out_curr = ab8500_charger_current_map[
ARRAY_SIZE(ab8500_charger_current_map) - 1];
di->ac_chg.wdt_refresh = CHG_WD_INTERVAL;
di->ac_chg.enabled = di->bm->ac_enabled;
di->ac_chg.external = false;
/* USB supply */
/* power_supply base class */
di->usb_chg.psy.name = "ab8500_usb";
di->usb_chg.psy.type = POWER_SUPPLY_TYPE_USB;
di->usb_chg.psy.properties = ab8500_charger_usb_props;
di->usb_chg.psy.num_properties = ARRAY_SIZE(ab8500_charger_usb_props);
di->usb_chg.psy.get_property = ab8500_charger_usb_get_property;
di->usb_chg.psy.supplied_to = supply_interface;
di->usb_chg.psy.num_supplicants = ARRAY_SIZE(supply_interface),
/* ux500_charger sub-class */
di->usb_chg.ops.enable = &ab8500_charger_usb_en;
di->usb_chg.ops.kick_wd = &ab8500_charger_watchdog_kick;
di->usb_chg.ops.update_curr = &ab8500_charger_update_charger_current;
di->usb_chg.max_out_volt = ab8500_charger_voltage_map[
ARRAY_SIZE(ab8500_charger_voltage_map) - 1];
di->usb_chg.max_out_curr = ab8500_charger_current_map[
ARRAY_SIZE(ab8500_charger_current_map) - 1];
di->usb_chg.wdt_refresh = CHG_WD_INTERVAL;
di->usb_chg.enabled = di->bm->usb_enabled;
di->usb_chg.external = false;
/* Create a work queue for the charger */
di->charger_wq =
create_singlethread_workqueue("ab8500_charger_wq");
if (di->charger_wq == NULL) {
dev_err(di->dev, "failed to create work queue\n");
return -ENOMEM;
}
mutex_init(&di->charger_attached_mutex);
/* Init work for HW failure check */
INIT_DEFERRABLE_WORK(&di->check_hw_failure_work,
ab8500_charger_check_hw_failure_work);
INIT_DEFERRABLE_WORK(&di->check_usbchgnotok_work,
ab8500_charger_check_usbchargernotok_work);
INIT_DELAYED_WORK(&di->ac_charger_attached_work,
ab8500_charger_ac_attached_work);
INIT_DELAYED_WORK(&di->usb_charger_attached_work,
ab8500_charger_usb_attached_work);
/*
* For ABB revision 1.0 and 1.1 there is a bug in the watchdog
* logic. That means we have to continously kick the charger
* watchdog even when no charger is connected. This is only
* valid once the AC charger has been enabled. This is
* a bug that is not handled by the algorithm and the
* watchdog have to be kicked by the charger driver
* when the AC charger is disabled
*/
INIT_DEFERRABLE_WORK(&di->kick_wd_work,
ab8500_charger_kick_watchdog_work);
INIT_DEFERRABLE_WORK(&di->check_vbat_work,
ab8500_charger_check_vbat_work);
INIT_DELAYED_WORK(&di->attach_work,
ab8500_charger_usb_link_attach_work);
INIT_DELAYED_WORK(&di->usb_state_changed_work,
ab8500_charger_usb_state_changed_work);
INIT_DELAYED_WORK(&di->vbus_drop_end_work,
ab8500_charger_vbus_drop_end_work);
/* Init work for charger detection */
INIT_WORK(&di->usb_link_status_work,
ab8500_charger_usb_link_status_work);
INIT_WORK(&di->ac_work, ab8500_charger_ac_work);
INIT_WORK(&di->detect_usb_type_work,
ab8500_charger_detect_usb_type_work);
/* Init work for checking HW status */
INIT_WORK(&di->check_main_thermal_prot_work,
ab8500_charger_check_main_thermal_prot_work);
INIT_WORK(&di->check_usb_thermal_prot_work,
ab8500_charger_check_usb_thermal_prot_work);
/*
* VDD ADC supply needs to be enabled from this driver when there
* is a charger connected to avoid erroneous BTEMP_HIGH/LOW
* interrupts during charging
*/
di->regu = devm_regulator_get(di->dev, "vddadc");
if (IS_ERR(di->regu)) {
ret = PTR_ERR(di->regu);
dev_err(di->dev, "failed to get vddadc regulator\n");
goto free_charger_wq;
}
/* Initialize OVV, and other registers */
ret = ab8500_charger_init_hw_registers(di);
if (ret) {
dev_err(di->dev, "failed to initialize ABB registers\n");
goto free_charger_wq;
}
/* Register AC charger class */
if(di->ac_chg.enabled) {
ret = power_supply_register(di->dev, &di->ac_chg.psy);
if (ret) {
dev_err(di->dev, "failed to register AC charger\n");
goto free_charger_wq;
}
}
/* Register USB charger class */
if(di->usb_chg.enabled) {
ret = power_supply_register(di->dev, &di->usb_chg.psy);
if (ret) {
dev_err(di->dev, "failed to register USB charger\n");
goto free_ac;
}
}
di->usb_phy = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(di->usb_phy)) {
dev_err(di->dev, "failed to get usb transceiver\n");
ret = -EINVAL;
goto free_usb;
}
di->nb.notifier_call = ab8500_charger_usb_notifier_call;
ret = usb_register_notifier(di->usb_phy, &di->nb);
if (ret) {
dev_err(di->dev, "failed to register usb notifier\n");
goto put_usb_phy;
}
/* Identify the connected charger types during startup */
charger_status = ab8500_charger_detect_chargers(di, true);
if (charger_status & AC_PW_CONN) {
di->ac.charger_connected = 1;
di->ac_conn = true;
ab8500_power_supply_changed(di, &di->ac_chg.psy);
sysfs_notify(&di->ac_chg.psy.dev->kobj, NULL, "present");
}
if (charger_status & USB_PW_CONN) {
di->vbus_detected = true;
di->vbus_detected_start = true;
queue_work(di->charger_wq,
&di->detect_usb_type_work);
}
/* Register interrupts */
for (i = 0; i < ARRAY_SIZE(ab8500_charger_irq); i++) {
irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
ret = request_threaded_irq(irq, NULL, ab8500_charger_irq[i].isr,
IRQF_SHARED | IRQF_NO_SUSPEND,
ab8500_charger_irq[i].name, di);
if (ret != 0) {
dev_err(di->dev, "failed to request %s IRQ %d: %d\n"
, ab8500_charger_irq[i].name, irq, ret);
goto free_irq;
}
dev_dbg(di->dev, "Requested %s IRQ %d: %d\n",
ab8500_charger_irq[i].name, irq, ret);
}
platform_set_drvdata(pdev, di);
mutex_lock(&di->charger_attached_mutex);
ch_stat = ab8500_charger_detect_chargers(di, false);
if ((ch_stat & AC_PW_CONN) == AC_PW_CONN) {
queue_delayed_work(di->charger_wq,
&di->ac_charger_attached_work,
HZ);
}
if ((ch_stat & USB_PW_CONN) == USB_PW_CONN) {
queue_delayed_work(di->charger_wq,
&di->usb_charger_attached_work,
HZ);
}
mutex_unlock(&di->charger_attached_mutex);
return ret;
free_irq:
usb_unregister_notifier(di->usb_phy, &di->nb);
/* We also have to free all successfully registered irqs */
for (i = i - 1; i >= 0; i--) {
irq = platform_get_irq_byname(pdev, ab8500_charger_irq[i].name);
free_irq(irq, di);
}
put_usb_phy:
usb_put_phy(di->usb_phy);
free_usb:
if(di->usb_chg.enabled)
power_supply_unregister(&di->usb_chg.psy);
free_ac:
if(di->ac_chg.enabled)
power_supply_unregister(&di->ac_chg.psy);
free_charger_wq:
destroy_workqueue(di->charger_wq);
return ret;
}
static const struct of_device_id ab8500_charger_match[] = {
{ .compatible = "stericsson,ab8500-charger", },
{ },
};
static struct platform_driver ab8500_charger_driver = {
.probe = ab8500_charger_probe,
.remove = ab8500_charger_remove,
.suspend = ab8500_charger_suspend,
.resume = ab8500_charger_resume,
.driver = {
.name = "ab8500-charger",
.owner = THIS_MODULE,
.of_match_table = ab8500_charger_match,
},
};
static int __init ab8500_charger_init(void)
{
return platform_driver_register(&ab8500_charger_driver);
}
static void __exit ab8500_charger_exit(void)
{
platform_driver_unregister(&ab8500_charger_driver);
}
subsys_initcall_sync(ab8500_charger_init);
module_exit(ab8500_charger_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Johan Palsson, Karl Komierowski, Arun R Murthy");
MODULE_ALIAS("platform:ab8500-charger");
MODULE_DESCRIPTION("AB8500 charger management driver");
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