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power: axp288_charger: axp288 charger driver

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This patch adds new power supply charger driver support
for X-Power AXP288 PMIC integrated charger.

This driver interfaces with the axp20x mfd driver as a cell
and listens to extcon cable events for setting up charging.

Signed-off-by: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
This commit is contained in:
Ramakrishna Pallala 2015-05-04 22:16:07 +05:30 committed by Sebastian Reichel
parent edd4ab0559
commit 843735b788
4 changed files with 956 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/power/Kconfig
View File

@ -204,6 +204,13 @@ config CHARGER_DA9150
This driver can also be built as a module. If so, the module will be
called da9150-charger.
config AXP288_CHARGER
tristate "X-Powers AXP288 Charger"
depends on MFD_AXP20X && EXTCON_AXP288
help
Say yes here to have support X-Power AXP288 power management IC (PMIC)
integrated charger.
config AXP288_FUEL_GAUGE
tristate "X-Powers AXP288 Fuel Gauge"
depends on MFD_AXP20X && IIO

1
drivers/power/Makefile
View File

@ -66,3 +66,4 @@ obj-$(CONFIG_CHARGER_SMB347) += smb347-charger.o
obj-$(CONFIG_CHARGER_TPS65090) += tps65090-charger.o
obj-$(CONFIG_POWER_RESET) += reset/
obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o

941
drivers/power/axp288_charger.c Normal file
View File

@ -0,0 +1,941 @@
/*
* axp288_charger.c - X-power AXP288 PMIC Charger driver
*
* Copyright (C) 2014 Intel Corporation
* Author: Ramakrishna Pallala <ramakrishna.pallala@intel.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/usb/otg.h>
#include <linux/notifier.h>
#include <linux/power_supply.h>
#include <linux/notifier.h>
#include <linux/property.h>
#include <linux/mfd/axp20x.h>
#include <linux/extcon.h>
#define PS_STAT_VBUS_TRIGGER (1 << 0)
#define PS_STAT_BAT_CHRG_DIR (1 << 2)
#define PS_STAT_VBAT_ABOVE_VHOLD (1 << 3)
#define PS_STAT_VBUS_VALID (1 << 4)
#define PS_STAT_VBUS_PRESENT (1 << 5)
#define CHRG_STAT_BAT_SAFE_MODE (1 << 3)
#define CHRG_STAT_BAT_VALID (1 << 4)
#define CHRG_STAT_BAT_PRESENT (1 << 5)
#define CHRG_STAT_CHARGING (1 << 6)
#define CHRG_STAT_PMIC_OTP (1 << 7)
#define VBUS_ISPOUT_CUR_LIM_MASK 0x03
#define VBUS_ISPOUT_CUR_LIM_BIT_POS 0
#define VBUS_ISPOUT_CUR_LIM_900MA 0x0 /* 900mA */
#define VBUS_ISPOUT_CUR_LIM_1500MA 0x1 /* 1500mA */
#define VBUS_ISPOUT_CUR_LIM_2000MA 0x2 /* 2000mA */
#define VBUS_ISPOUT_CUR_NO_LIM 0x3 /* 2500mA */
#define VBUS_ISPOUT_VHOLD_SET_MASK 0x31
#define VBUS_ISPOUT_VHOLD_SET_BIT_POS 0x3
#define VBUS_ISPOUT_VHOLD_SET_OFFSET 4000 /* 4000mV */
#define VBUS_ISPOUT_VHOLD_SET_LSB_RES 100 /* 100mV */
#define VBUS_ISPOUT_VHOLD_SET_4300MV 0x3 /* 4300mV */
#define VBUS_ISPOUT_VBUS_PATH_DIS (1 << 7)
#define CHRG_CCCV_CC_MASK 0xf /* 4 bits */
#define CHRG_CCCV_CC_BIT_POS 0
#define CHRG_CCCV_CC_OFFSET 200 /* 200mA */
#define CHRG_CCCV_CC_LSB_RES 200 /* 200mA */
#define CHRG_CCCV_ITERM_20P (1 << 4) /* 20% of CC */
#define CHRG_CCCV_CV_MASK 0x60 /* 2 bits */
#define CHRG_CCCV_CV_BIT_POS 5
#define CHRG_CCCV_CV_4100MV 0x0 /* 4.10V */
#define CHRG_CCCV_CV_4150MV 0x1 /* 4.15V */
#define CHRG_CCCV_CV_4200MV 0x2 /* 4.20V */
#define CHRG_CCCV_CV_4350MV 0x3 /* 4.35V */
#define CHRG_CCCV_CHG_EN (1 << 7)
#define CNTL2_CC_TIMEOUT_MASK 0x3 /* 2 bits */
#define CNTL2_CC_TIMEOUT_OFFSET 6 /* 6 Hrs */
#define CNTL2_CC_TIMEOUT_LSB_RES 2 /* 2 Hrs */
#define CNTL2_CC_TIMEOUT_12HRS 0x3 /* 12 Hrs */
#define CNTL2_CHGLED_TYPEB (1 << 4)
#define CNTL2_CHG_OUT_TURNON (1 << 5)
#define CNTL2_PC_TIMEOUT_MASK 0xC0
#define CNTL2_PC_TIMEOUT_OFFSET 40 /* 40 mins */
#define CNTL2_PC_TIMEOUT_LSB_RES 10 /* 10 mins */
#define CNTL2_PC_TIMEOUT_70MINS 0x3
#define CHRG_ILIM_TEMP_LOOP_EN (1 << 3)
#define CHRG_VBUS_ILIM_MASK 0xf0
#define CHRG_VBUS_ILIM_BIT_POS 4
#define CHRG_VBUS_ILIM_100MA 0x0 /* 100mA */
#define CHRG_VBUS_ILIM_500MA 0x1 /* 500mA */
#define CHRG_VBUS_ILIM_900MA 0x2 /* 900mA */
#define CHRG_VBUS_ILIM_1500MA 0x3 /* 1500mA */
#define CHRG_VBUS_ILIM_2000MA 0x4 /* 2000mA */
#define CHRG_VBUS_ILIM_2500MA 0x5 /* 2500mA */
#define CHRG_VBUS_ILIM_3000MA 0x6 /* 3000mA */
#define CHRG_VLTFC_0C 0xA5 /* 0 DegC */
#define CHRG_VHTFC_45C 0x1F /* 45 DegC */
#define BAT_IRQ_CFG_CHRG_DONE (1 << 2)
#define BAT_IRQ_CFG_CHRG_START (1 << 3)
#define BAT_IRQ_CFG_BAT_SAFE_EXIT (1 << 4)
#define BAT_IRQ_CFG_BAT_SAFE_ENTER (1 << 5)
#define BAT_IRQ_CFG_BAT_DISCON (1 << 6)
#define BAT_IRQ_CFG_BAT_CONN (1 << 7)
#define BAT_IRQ_CFG_BAT_MASK 0xFC
#define TEMP_IRQ_CFG_QCBTU (1 << 4)
#define TEMP_IRQ_CFG_CBTU (1 << 5)
#define TEMP_IRQ_CFG_QCBTO (1 << 6)
#define TEMP_IRQ_CFG_CBTO (1 << 7)
#define TEMP_IRQ_CFG_MASK 0xF0
#define FG_CNTL_OCV_ADJ_EN (1 << 3)
#define CV_4100MV 4100 /* 4100mV */
#define CV_4150MV 4150 /* 4150mV */
#define CV_4200MV 4200 /* 4200mV */
#define CV_4350MV 4350 /* 4350mV */
#define CC_200MA 200 /* 200mA */
#define CC_600MA 600 /* 600mA */
#define CC_800MA 800 /* 800mA */
#define CC_1000MA 1000 /* 1000mA */
#define CC_1600MA 1600 /* 1600mA */
#define CC_2000MA 2000 /* 2000mA */
#define ILIM_100MA 100 /* 100mA */
#define ILIM_500MA 500 /* 500mA */
#define ILIM_900MA 900 /* 900mA */
#define ILIM_1500MA 1500 /* 1500mA */
#define ILIM_2000MA 2000 /* 2000mA */
#define ILIM_2500MA 2500 /* 2500mA */
#define ILIM_3000MA 3000 /* 3000mA */
#define AXP288_EXTCON_DEV_NAME "axp288_extcon"
#define AXP288_EXTCON_SLOW_CHARGER "SLOW-CHARGER"
#define AXP288_EXTCON_DOWNSTREAM_CHARGER "CHARGE-DOWNSTREAM"
#define AXP288_EXTCON_FAST_CHARGER "FAST-CHARGER"
enum {
VBUS_OV_IRQ = 0,
CHARGE_DONE_IRQ,
CHARGE_CHARGING_IRQ,
BAT_SAFE_QUIT_IRQ,
BAT_SAFE_ENTER_IRQ,
QCBTU_IRQ,
CBTU_IRQ,
QCBTO_IRQ,
CBTO_IRQ,
CHRG_INTR_END,
};
struct axp288_chrg_info {
struct platform_device *pdev;
struct axp20x_chrg_pdata *pdata;
struct regmap *regmap;
struct regmap_irq_chip_data *regmap_irqc;
int irq[CHRG_INTR_END];
struct power_supply *psy_usb;
struct mutex lock;
/* OTG/Host mode */
struct {
struct work_struct work;
struct extcon_specific_cable_nb cable;
struct notifier_block id_nb;
bool id_short;
} otg;
/* SDP/CDP/DCP USB charging cable notifications */
struct {
struct extcon_dev *edev;
bool connected;
enum power_supply_type chg_type;
struct notifier_block nb;
struct work_struct work;
} cable;
int health;
int inlmt;
int cc;
int cv;
int max_cc;
int max_cv;
bool online;
bool present;
bool enable_charger;
bool is_charger_enabled;
};
static inline int axp288_charger_set_cc(struct axp288_chrg_info *info, int cc)
{
u8 reg_val;
int ret;
if (cc < CHRG_CCCV_CC_OFFSET)
cc = CHRG_CCCV_CC_OFFSET;
else if (cc > info->max_cc)
cc = info->max_cc;
reg_val = (cc - CHRG_CCCV_CC_OFFSET) / CHRG_CCCV_CC_LSB_RES;
cc = (reg_val * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
reg_val = reg_val << CHRG_CCCV_CC_BIT_POS;
ret = regmap_update_bits(info->regmap,
AXP20X_CHRG_CTRL1,
CHRG_CCCV_CC_MASK, reg_val);
if (ret >= 0)
info->cc = cc;
return ret;
}
static inline int axp288_charger_set_cv(struct axp288_chrg_info *info, int cv)
{
u8 reg_val;
int ret;
if (cv <= CV_4100MV) {
reg_val = CHRG_CCCV_CV_4100MV;
cv = CV_4100MV;
} else if (cv <= CV_4150MV) {
reg_val = CHRG_CCCV_CV_4150MV;
cv = CV_4150MV;
} else if (cv <= CV_4200MV) {
reg_val = CHRG_CCCV_CV_4200MV;
cv = CV_4200MV;
} else {
reg_val = CHRG_CCCV_CV_4350MV;
cv = CV_4350MV;
}
reg_val = reg_val << CHRG_CCCV_CV_BIT_POS;
ret = regmap_update_bits(info->regmap,
AXP20X_CHRG_CTRL1,
CHRG_CCCV_CV_MASK, reg_val);
if (ret >= 0)
info->cv = cv;
return ret;
}
static inline int axp288_charger_set_vbus_inlmt(struct axp288_chrg_info *info,
int inlmt)
{
int ret;
unsigned int val;
u8 reg_val;
/* Read in limit register */
ret = regmap_read(info->regmap, AXP20X_CHRG_BAK_CTRL, &val);
if (ret < 0)
goto set_inlmt_fail;
if (inlmt <= ILIM_100MA) {
reg_val = CHRG_VBUS_ILIM_100MA;
inlmt = ILIM_100MA;
} else if (inlmt <= ILIM_500MA) {
reg_val = CHRG_VBUS_ILIM_500MA;
inlmt = ILIM_500MA;
} else if (inlmt <= ILIM_900MA) {
reg_val = CHRG_VBUS_ILIM_900MA;
inlmt = ILIM_900MA;
} else if (inlmt <= ILIM_1500MA) {
reg_val = CHRG_VBUS_ILIM_1500MA;
inlmt = ILIM_1500MA;
} else if (inlmt <= ILIM_2000MA) {
reg_val = CHRG_VBUS_ILIM_2000MA;
inlmt = ILIM_2000MA;
} else if (inlmt <= ILIM_2500MA) {
reg_val = CHRG_VBUS_ILIM_2500MA;
inlmt = ILIM_2500MA;
} else {
reg_val = CHRG_VBUS_ILIM_3000MA;
inlmt = ILIM_3000MA;
}
reg_val = (val & ~CHRG_VBUS_ILIM_MASK)
| (reg_val << CHRG_VBUS_ILIM_BIT_POS);
ret = regmap_write(info->regmap, AXP20X_CHRG_BAK_CTRL, reg_val);
if (ret >= 0)
info->inlmt = inlmt;
else
dev_err(&info->pdev->dev, "charger BAK control %d\n", ret);
set_inlmt_fail:
return ret;
}
static int axp288_charger_vbus_path_select(struct axp288_chrg_info *info,
bool enable)
{
int ret;
if (enable)
ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
VBUS_ISPOUT_VBUS_PATH_DIS, 0);
else
ret = regmap_update_bits(info->regmap, AXP20X_VBUS_IPSOUT_MGMT,
VBUS_ISPOUT_VBUS_PATH_DIS, VBUS_ISPOUT_VBUS_PATH_DIS);
if (ret < 0)
dev_err(&info->pdev->dev, "axp288 vbus path select %d\n", ret);
return ret;
}
static int axp288_charger_enable_charger(struct axp288_chrg_info *info,
bool enable)
{
int ret;
if (enable)
ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
CHRG_CCCV_CHG_EN, CHRG_CCCV_CHG_EN);
else
ret = regmap_update_bits(info->regmap, AXP20X_CHRG_CTRL1,
CHRG_CCCV_CHG_EN, 0);
if (ret < 0)
dev_err(&info->pdev->dev, "axp288 enable charger %d\n", ret);
else
info->is_charger_enabled = enable;
return ret;
}
static int axp288_charger_is_present(struct axp288_chrg_info *info)
{
int ret, present = 0;
unsigned int val;
ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
if (ret < 0)
return ret;
if (val & PS_STAT_VBUS_PRESENT)
present = 1;
return present;
}
static int axp288_charger_is_online(struct axp288_chrg_info *info)
{
int ret, online = 0;
unsigned int val;
ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
if (ret < 0)
return ret;
if (val & PS_STAT_VBUS_VALID)
online = 1;
return online;
}
static int axp288_get_charger_health(struct axp288_chrg_info *info)
{
int ret, pwr_stat, chrg_stat;
int health = POWER_SUPPLY_HEALTH_UNKNOWN;
unsigned int val;
ret = regmap_read(info->regmap, AXP20X_PWR_INPUT_STATUS, &val);
if ((ret < 0) || !(val & PS_STAT_VBUS_PRESENT))
goto health_read_fail;
else
pwr_stat = val;
ret = regmap_read(info->regmap, AXP20X_PWR_OP_MODE, &val);
if (ret < 0)
goto health_read_fail;
else
chrg_stat = val;
if (!(pwr_stat & PS_STAT_VBUS_VALID))
health = POWER_SUPPLY_HEALTH_DEAD;
else if (chrg_stat & CHRG_STAT_PMIC_OTP)
health = POWER_SUPPLY_HEALTH_OVERHEAT;
else if (chrg_stat & CHRG_STAT_BAT_SAFE_MODE)
health = POWER_SUPPLY_HEALTH_SAFETY_TIMER_EXPIRE;
else
health = POWER_SUPPLY_HEALTH_GOOD;
health_read_fail:
return health;
}
static int axp288_charger_usb_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
int ret = 0;
int scaled_val;
mutex_lock(&info->lock);
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
scaled_val = min(val->intval, info->max_cc);
scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
ret = axp288_charger_set_cc(info, scaled_val);
if (ret < 0)
dev_warn(&info->pdev->dev, "set charge current failed\n");
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
scaled_val = min(val->intval, info->max_cv);
scaled_val = DIV_ROUND_CLOSEST(scaled_val, 1000);
ret = axp288_charger_set_cv(info, scaled_val);
if (ret < 0)
dev_warn(&info->pdev->dev, "set charge voltage failed\n");
break;
default:
ret = -EINVAL;
}
mutex_unlock(&info->lock);
return ret;
}
static int axp288_charger_usb_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct axp288_chrg_info *info = power_supply_get_drvdata(psy);
int ret = 0;
mutex_lock(&info->lock);
switch (psp) {
case POWER_SUPPLY_PROP_PRESENT:
/* Check for OTG case first */
if (info->otg.id_short) {
val->intval = 0;
break;
}
ret = axp288_charger_is_present(info);
if (ret < 0)
goto psy_get_prop_fail;
info->present = ret;
val->intval = info->present;
break;
case POWER_SUPPLY_PROP_ONLINE:
/* Check for OTG case first */
if (info->otg.id_short) {
val->intval = 0;
break;
}
ret = axp288_charger_is_online(info);
if (ret < 0)
goto psy_get_prop_fail;
info->online = ret;
val->intval = info->online;
break;
case POWER_SUPPLY_PROP_HEALTH:
val->intval = axp288_get_charger_health(info);
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
val->intval = info->cc * 1000;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX:
val->intval = info->max_cc * 1000;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
val->intval = info->cv * 1000;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX:
val->intval = info->max_cv * 1000;
break;
case POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT:
val->intval = info->inlmt * 1000;
break;
default:
ret = -EINVAL;
goto psy_get_prop_fail;
}
psy_get_prop_fail:
mutex_unlock(&info->lock);
return ret;
}
static int axp288_charger_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
int ret;
switch (psp) {
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
ret = 1;
break;
default:
ret = 0;
}
return ret;
}
static enum power_supply_property axp288_usb_props[] = {
POWER_SUPPLY_PROP_PRESENT,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_TYPE,
POWER_SUPPLY_PROP_HEALTH,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT_MAX,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE_MAX,
POWER_SUPPLY_PROP_CHARGE_CONTROL_LIMIT,
};
static const struct power_supply_desc axp288_charger_desc = {
.name = "axp288_charger",
.type = POWER_SUPPLY_TYPE_USB,
.properties = axp288_usb_props,
.num_properties = ARRAY_SIZE(axp288_usb_props),
.get_property = axp288_charger_usb_get_property,
.set_property = axp288_charger_usb_set_property,
.property_is_writeable = axp288_charger_property_is_writeable,
};
static irqreturn_t axp288_charger_irq_thread_handler(int irq, void *dev)
{
struct axp288_chrg_info *info = dev;
int i;
for (i = 0; i < CHRG_INTR_END; i++) {
if (info->irq[i] == irq)
break;
}
if (i >= CHRG_INTR_END) {
dev_warn(&info->pdev->dev, "spurious interrupt!!\n");
return IRQ_NONE;
}
switch (i) {
case VBUS_OV_IRQ:
dev_dbg(&info->pdev->dev, "VBUS Over Voltage INTR\n");
break;
case CHARGE_DONE_IRQ:
dev_dbg(&info->pdev->dev, "Charging Done INTR\n");
break;
case CHARGE_CHARGING_IRQ:
dev_dbg(&info->pdev->dev, "Start Charging IRQ\n");
break;
case BAT_SAFE_QUIT_IRQ:
dev_dbg(&info->pdev->dev,
"Quit Safe Mode(restart timer) Charging IRQ\n");
break;
case BAT_SAFE_ENTER_IRQ:
dev_dbg(&info->pdev->dev,
"Enter Safe Mode(timer expire) Charging IRQ\n");
break;
case QCBTU_IRQ:
dev_dbg(&info->pdev->dev,
"Quit Battery Under Temperature(CHRG) INTR\n");
break;
case CBTU_IRQ:
dev_dbg(&info->pdev->dev,
"Hit Battery Under Temperature(CHRG) INTR\n");
break;
case QCBTO_IRQ:
dev_dbg(&info->pdev->dev,
"Quit Battery Over Temperature(CHRG) INTR\n");
break;
case CBTO_IRQ:
dev_dbg(&info->pdev->dev,
"Hit Battery Over Temperature(CHRG) INTR\n");
break;
default:
dev_warn(&info->pdev->dev, "Spurious Interrupt!!!\n");
goto out;
}
power_supply_changed(info->psy_usb);
out:
return IRQ_HANDLED;
}
static void axp288_charger_extcon_evt_worker(struct work_struct *work)
{
struct axp288_chrg_info *info =
container_of(work, struct axp288_chrg_info, cable.work);
int ret, current_limit;
bool changed = false;
struct extcon_dev *edev = info->cable.edev;
bool old_connected = info->cable.connected;
/* Determine cable/charger type */
if (extcon_get_cable_state(edev, AXP288_EXTCON_SLOW_CHARGER) > 0) {
dev_dbg(&info->pdev->dev, "USB SDP charger is connected");
info->cable.connected = true;
info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
} else if (extcon_get_cable_state(edev,
AXP288_EXTCON_DOWNSTREAM_CHARGER) > 0) {
dev_dbg(&info->pdev->dev, "USB CDP charger is connected");
info->cable.connected = true;
info->cable.chg_type = POWER_SUPPLY_TYPE_USB_CDP;
} else if (extcon_get_cable_state(edev,
AXP288_EXTCON_FAST_CHARGER) > 0) {
dev_dbg(&info->pdev->dev, "USB DCP charger is connected");
info->cable.connected = true;
info->cable.chg_type = POWER_SUPPLY_TYPE_USB_DCP;
} else {
if (old_connected)
dev_dbg(&info->pdev->dev, "USB charger disconnected");
info->cable.connected = false;
info->cable.chg_type = POWER_SUPPLY_TYPE_USB;
}
/* Cable status changed */
if (old_connected != info->cable.connected)
changed = true;
if (!changed)
return;
mutex_lock(&info->lock);
if (info->is_charger_enabled && !info->cable.connected) {
info->enable_charger = false;
ret = axp288_charger_enable_charger(info, info->enable_charger);
if (ret < 0)
dev_err(&info->pdev->dev,
"cannot disable charger (%d)", ret);
} else if (!info->is_charger_enabled && info->cable.connected) {
switch (info->cable.chg_type) {
case POWER_SUPPLY_TYPE_USB:
current_limit = ILIM_500MA;
break;
case POWER_SUPPLY_TYPE_USB_CDP:
current_limit = ILIM_1500MA;
break;
case POWER_SUPPLY_TYPE_USB_DCP:
current_limit = ILIM_2000MA;
break;
default:
/* Unknown */
current_limit = 0;
break;
}
/* Set vbus current limit first, then enable charger */
ret = axp288_charger_set_vbus_inlmt(info, current_limit);
if (ret < 0) {
dev_err(&info->pdev->dev,
"error setting current limit (%d)", ret);
} else {
info->enable_charger = (current_limit > 0);
ret = axp288_charger_enable_charger(info,
info->enable_charger);
if (ret < 0)
dev_err(&info->pdev->dev,
"cannot enable charger (%d)", ret);
}
}
if (changed)
info->health = axp288_get_charger_health(info);
mutex_unlock(&info->lock);
if (changed)
power_supply_changed(info->psy_usb);
}
static int axp288_charger_handle_cable_evt(struct notifier_block *nb,
unsigned long event, void *param)
{
struct axp288_chrg_info *info =
container_of(nb, struct axp288_chrg_info, cable.nb);
schedule_work(&info->cable.work);
return NOTIFY_OK;
}
static void axp288_charger_otg_evt_worker(struct work_struct *work)
{
struct axp288_chrg_info *info =
container_of(work, struct axp288_chrg_info, otg.work);
int ret;
/* Disable VBUS path before enabling the 5V boost */
ret = axp288_charger_vbus_path_select(info, !info->otg.id_short);
if (ret < 0)
dev_warn(&info->pdev->dev, "vbus path disable failed\n");
}
static int axp288_charger_handle_otg_evt(struct notifier_block *nb,
unsigned long event, void *param)
{
struct axp288_chrg_info *info =
container_of(nb, struct axp288_chrg_info, otg.id_nb);
struct extcon_dev *edev = param;
int usb_host = extcon_get_cable_state(edev, "USB-Host");
dev_dbg(&info->pdev->dev, "external connector USB-Host is %s\n",
usb_host ? "attached" : "detached");
/*
* Set usb_id_short flag to avoid running charger detection logic
* in case usb host.
*/
info->otg.id_short = usb_host;
schedule_work(&info->otg.work);
return NOTIFY_OK;
}
static void charger_init_hw_regs(struct axp288_chrg_info *info)
{
int ret, cc, cv;
unsigned int val;
/* Program temperature thresholds */
ret = regmap_write(info->regmap, AXP20X_V_LTF_CHRG, CHRG_VLTFC_0C);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_V_LTF_CHRG, ret);
ret = regmap_write(info->regmap, AXP20X_V_HTF_CHRG, CHRG_VHTFC_45C);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_V_HTF_CHRG, ret);
/* Do not turn-off charger o/p after charge cycle ends */
ret = regmap_update_bits(info->regmap,
AXP20X_CHRG_CTRL2,
CNTL2_CHG_OUT_TURNON, 1);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_CHRG_CTRL2, ret);
/* Enable interrupts */
ret = regmap_update_bits(info->regmap,
AXP20X_IRQ2_EN,
BAT_IRQ_CFG_BAT_MASK, 1);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_IRQ2_EN, ret);
ret = regmap_update_bits(info->regmap, AXP20X_IRQ3_EN,
TEMP_IRQ_CFG_MASK, 1);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_IRQ3_EN, ret);
/* Setup ending condition for charging to be 10% of I(chrg) */
ret = regmap_update_bits(info->regmap,
AXP20X_CHRG_CTRL1,
CHRG_CCCV_ITERM_20P, 0);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_CHRG_CTRL1, ret);
/* Disable OCV-SOC curve calibration */
ret = regmap_update_bits(info->regmap,
AXP20X_CC_CTRL,
FG_CNTL_OCV_ADJ_EN, 0);
if (ret < 0)
dev_warn(&info->pdev->dev, "register(%x) write error(%d)\n",
AXP20X_CC_CTRL, ret);
/* Init charging current and voltage */
info->max_cc = info->pdata->max_cc;
info->max_cv = info->pdata->max_cv;
/* Read current charge voltage and current limit */
ret = regmap_read(info->regmap, AXP20X_CHRG_CTRL1, &val);
if (ret < 0) {
/* Assume default if cannot read */
info->cc = info->pdata->def_cc;
info->cv = info->pdata->def_cv;
} else {
/* Determine charge voltage */
cv = (val & CHRG_CCCV_CV_MASK) >> CHRG_CCCV_CV_BIT_POS;
switch (cv) {
case CHRG_CCCV_CV_4100MV:
info->cv = CV_4100MV;
break;
case CHRG_CCCV_CV_4150MV:
info->cv = CV_4150MV;
break;
case CHRG_CCCV_CV_4200MV:
info->cv = CV_4200MV;
break;
case CHRG_CCCV_CV_4350MV:
info->cv = CV_4350MV;
break;
default:
info->cv = INT_MAX;
break;
}
/* Determine charge current limit */
cc = (ret & CHRG_CCCV_CC_MASK) >> CHRG_CCCV_CC_BIT_POS;
cc = (cc * CHRG_CCCV_CC_LSB_RES) + CHRG_CCCV_CC_OFFSET;
info->cc = cc;
/* Program default charging voltage and current */
cc = min(info->pdata->def_cc, info->max_cc);
cv = min(info->pdata->def_cv, info->max_cv);
ret = axp288_charger_set_cc(info, cc);
if (ret < 0)
dev_warn(&info->pdev->dev,
"error(%d) in setting CC\n", ret);
ret = axp288_charger_set_cv(info, cv);
if (ret < 0)
dev_warn(&info->pdev->dev,
"error(%d) in setting CV\n", ret);
}
}
static int axp288_charger_probe(struct platform_device *pdev)
{
int ret, i, pirq;
struct axp288_chrg_info *info;
struct axp20x_dev *axp20x = dev_get_drvdata(pdev->dev.parent);
struct power_supply_config charger_cfg = {};
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->pdev = pdev;
info->regmap = axp20x->regmap;
info->regmap_irqc = axp20x->regmap_irqc;
info->pdata = pdev->dev.platform_data;
if (!info->pdata) {
/* Try ACPI provided pdata via device properties */
if (!device_property_present(&pdev->dev,
"axp288_charger_data\n"))
dev_err(&pdev->dev, "failed to get platform data\n");
return -ENODEV;
}
info->cable.edev = extcon_get_extcon_dev(AXP288_EXTCON_DEV_NAME);
if (info->cable.edev == NULL) {
dev_dbg(&pdev->dev, "%s is not ready, probe deferred\n",
AXP288_EXTCON_DEV_NAME);
return -EPROBE_DEFER;
}
/* Register for extcon notification */
INIT_WORK(&info->cable.work, axp288_charger_extcon_evt_worker);
info->cable.nb.notifier_call = axp288_charger_handle_cable_evt;
ret = extcon_register_notifier(info->cable.edev, &info->cable.nb);
if (ret) {
dev_err(&info->pdev->dev,
"failed to register extcon notifier %d\n", ret);
return ret;
}
platform_set_drvdata(pdev, info);
mutex_init(&info->lock);
/* Register with power supply class */
charger_cfg.drv_data = info;
info->psy_usb = power_supply_register(&pdev->dev, &axp288_charger_desc,
&charger_cfg);
if (IS_ERR(info->psy_usb)) {
dev_err(&pdev->dev, "failed to register power supply charger\n");
ret = PTR_ERR(info->psy_usb);
goto psy_reg_failed;
}
/* Register for OTG notification */
INIT_WORK(&info->otg.work, axp288_charger_otg_evt_worker);
info->otg.id_nb.notifier_call = axp288_charger_handle_otg_evt;
ret = extcon_register_interest(&info->otg.cable, NULL, "USB-Host",
&info->otg.id_nb);
if (ret)
dev_warn(&pdev->dev, "failed to register otg notifier\n");
if (info->otg.cable.edev)
info->otg.id_short = extcon_get_cable_state(
info->otg.cable.edev, "USB-Host");
/* Register charger interrupts */
for (i = 0; i < CHRG_INTR_END; i++) {
pirq = platform_get_irq(info->pdev, i);
info->irq[i] = regmap_irq_get_virq(info->regmap_irqc, pirq);
if (info->irq[i] < 0) {
dev_warn(&info->pdev->dev,
"failed to get virtual interrupt=%d\n", pirq);
ret = info->irq[i];
goto intr_reg_failed;
}
ret = devm_request_threaded_irq(&info->pdev->dev, info->irq[i],
NULL, axp288_charger_irq_thread_handler,
IRQF_ONESHOT, info->pdev->name, info);
if (ret) {
dev_err(&pdev->dev, "failed to request interrupt=%d\n",
info->irq[i]);
goto intr_reg_failed;
}
}
charger_init_hw_regs(info);
return 0;
intr_reg_failed:
if (info->otg.cable.edev)
extcon_unregister_interest(&info->otg.cable);
power_supply_unregister(info->psy_usb);
psy_reg_failed:
extcon_unregister_notifier(info->cable.edev, &info->cable.nb);
return ret;
}
static int axp288_charger_remove(struct platform_device *pdev)
{
struct axp288_chrg_info *info = dev_get_drvdata(&pdev->dev);
if (info->otg.cable.edev)
extcon_unregister_interest(&info->otg.cable);
extcon_unregister_notifier(info->cable.edev, &info->cable.nb);
power_supply_unregister(info->psy_usb);
return 0;
}
static struct platform_driver axp288_charger_driver = {
.probe = axp288_charger_probe,
.remove = axp288_charger_remove,
.driver = {
.name = "axp288_charger",
},
};
module_platform_driver(axp288_charger_driver);
MODULE_AUTHOR("Ramakrishna Pallala <ramakrishna.pallala@intel.com>");
MODULE_DESCRIPTION("X-power AXP288 Charger Driver");
MODULE_LICENSE("GPL v2");

7
include/linux/mfd/axp20x.h
View File

@ -275,4 +275,11 @@ struct axp20x_fg_pdata {
int thermistor_curve[MAX_THERM_CURVE_SIZE][2];
};
struct axp20x_chrg_pdata {
int max_cc;
int max_cv;
int def_cc;
int def_cv;
};
#endif /* __LINUX_MFD_AXP20X_H */