// SPDX-License-Identifier: GPL-2.0-only
/*
* Motorola CPCAP PMIC battery charger driver
*
* Copyright (C) 2017 Tony Lindgren <tony@atomide.com>
*
* Rewritten for Linux power framework with some parts based on
* on earlier driver found in the Motorola Linux kernel:
*
* Copyright (C) 2009-2010 Motorola, Inc.
*/
#include <linux/atomic.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/power_supply.h>
#include <linux/regmap.h>
#include <linux/gpio/consumer.h>
#include <linux/usb/phy_companion.h>
#include <linux/phy/omap_usb.h>
#include <linux/usb/otg.h>
#include <linux/iio/consumer.h>
#include <linux/mfd/motorola-cpcap.h>
/*
* CPCAP_REG_CRM register bits. For documentation of somewhat similar hardware,
* see NXP "MC13783 Power Management and Audio Circuit Users's Guide"
* MC13783UG.pdf chapter "8.5 Battery Interface Register Summary". The registers
* and values for CPCAP are different, but some of the internal components seem
* similar. Also see the Motorola Linux kernel cpcap-regbits.h. CPCAP_REG_CHRGR_1
* bits that seem to describe the CRM register.
*/
#define CPCAP_REG_CRM_UNUSED_641_15 BIT(15) /* 641 = register number */
#define CPCAP_REG_CRM_UNUSED_641_14 BIT(14) /* 641 = register number */
#define CPCAP_REG_CRM_CHRG_LED_EN BIT(13) /* Charger LED */
#define CPCAP_REG_CRM_RVRSMODE BIT(12) /* USB VBUS output enable */
#define CPCAP_REG_CRM_ICHRG_TR1 BIT(11) /* Trickle charge current */
#define CPCAP_REG_CRM_ICHRG_TR0 BIT(10)
#define CPCAP_REG_CRM_FET_OVRD BIT(9) /* 0 = hardware, 1 = FET_CTRL */
#define CPCAP_REG_CRM_FET_CTRL BIT(8) /* BPFET 1 if FET_OVRD set */
#define CPCAP_REG_CRM_VCHRG3 BIT(7) /* Charge voltage bits */
#define CPCAP_REG_CRM_VCHRG2 BIT(6)
#define CPCAP_REG_CRM_VCHRG1 BIT(5)
#define CPCAP_REG_CRM_VCHRG0 BIT(4)
#define CPCAP_REG_CRM_ICHRG3 BIT(3) /* Charge current bits */
#define CPCAP_REG_CRM_ICHRG2 BIT(2)
#define CPCAP_REG_CRM_ICHRG1 BIT(1)
#define CPCAP_REG_CRM_ICHRG0 BIT(0)
/* CPCAP_REG_CRM trickle charge voltages */
#define CPCAP_REG_CRM_TR(val) (((val) & 0x3) << 10)
#define CPCAP_REG_CRM_TR_0A00 CPCAP_REG_CRM_TR(0x0)
#define CPCAP_REG_CRM_TR_0A24 CPCAP_REG_CRM_TR(0x1)
#define CPCAP_REG_CRM_TR_0A48 CPCAP_REG_CRM_TR(0x2)
#define CPCAP_REG_CRM_TR_0A72 CPCAP_REG_CRM_TR(0x4)
/*
* CPCAP_REG_CRM charge voltages based on the ADC channel 1 values.
* Note that these register bits don't match MC13783UG.pdf VCHRG
* register bits.
*/
#define CPCAP_REG_CRM_VCHRG(val) (((val) & 0xf) << 4)
#define CPCAP_REG_CRM_VCHRG_3V80 CPCAP_REG_CRM_VCHRG(0x0)
#define CPCAP_REG_CRM_VCHRG_4V10 CPCAP_REG_CRM_VCHRG(0x1)
#define CPCAP_REG_CRM_VCHRG_4V12 CPCAP_REG_CRM_VCHRG(0x2)
#define CPCAP_REG_CRM_VCHRG_4V15 CPCAP_REG_CRM_VCHRG(0x3)
#define CPCAP_REG_CRM_VCHRG_4V17 CPCAP_REG_CRM_VCHRG(0x4)
#define CPCAP_REG_CRM_VCHRG_4V20 CPCAP_REG_CRM_VCHRG(0x5)
#define CPCAP_REG_CRM_VCHRG_4V23 CPCAP_REG_CRM_VCHRG(0x6)
#define CPCAP_REG_CRM_VCHRG_4V25 CPCAP_REG_CRM_VCHRG(0x7)
#define CPCAP_REG_CRM_VCHRG_4V27 CPCAP_REG_CRM_VCHRG(0x8)
#define CPCAP_REG_CRM_VCHRG_4V30 CPCAP_REG_CRM_VCHRG(0x9)
#define CPCAP_REG_CRM_VCHRG_4V33 CPCAP_REG_CRM_VCHRG(0xa)
#define CPCAP_REG_CRM_VCHRG_4V35 CPCAP_REG_CRM_VCHRG(0xb)
#define CPCAP_REG_CRM_VCHRG_4V38 CPCAP_REG_CRM_VCHRG(0xc)
#define CPCAP_REG_CRM_VCHRG_4V40 CPCAP_REG_CRM_VCHRG(0xd)
#define CPCAP_REG_CRM_VCHRG_4V42 CPCAP_REG_CRM_VCHRG(0xe)
#define CPCAP_REG_CRM_VCHRG_4V44 CPCAP_REG_CRM_VCHRG(0xf)
/*
* CPCAP_REG_CRM charge currents. These seem to match MC13783UG.pdf
* values in "Table 8-3. Charge Path Regulator Current Limit
* Characteristics" for the nominal values.
*
* Except 70mA and 1.596A and unlimited, these are simply 88.7mA / step.
*/
#define CPCAP_REG_CRM_ICHRG(val) (((val) & 0xf) << 0)
#define CPCAP_REG_CRM_ICHRG_0A000 CPCAP_REG_CRM_ICHRG(0x0)
#define CPCAP_REG_CRM_ICHRG_0A070 CPCAP_REG_CRM_ICHRG(0x1)
#define CPCAP_REG_CRM_ICHRG_0A177 CPCAP_REG_CRM_ICHRG(0x2)
#define CPCAP_REG_CRM_ICHRG_0A266 CPCAP_REG_CRM_ICHRG(0x3)
#define CPCAP_REG_CRM_ICHRG_0A355 CPCAP_REG_CRM_ICHRG(0x4)
#define CPCAP_REG_CRM_ICHRG_0A443 CPCAP_REG_CRM_ICHRG(0x5)
#define CPCAP_REG_CRM_ICHRG_0A532 CPCAP_REG_CRM_ICHRG(0x6)
#define CPCAP_REG_CRM_ICHRG_0A621 CPCAP_REG_CRM_ICHRG(0x7)
#define CPCAP_REG_CRM_ICHRG_0A709 CPCAP_REG_CRM_ICHRG(0x8)
#define CPCAP_REG_CRM_ICHRG_0A798 CPCAP_REG_CRM_ICHRG(0x9)
#define CPCAP_REG_CRM_ICHRG_0A886 CPCAP_REG_CRM_ICHRG(0xa)
#define CPCAP_REG_CRM_ICHRG_0A975 CPCAP_REG_CRM_ICHRG(0xb)
#define CPCAP_REG_CRM_ICHRG_1A064 CPCAP_REG_CRM_ICHRG(0xc)
#define CPCAP_REG_CRM_ICHRG_1A152 CPCAP_REG_CRM_ICHRG(0xd)
#define CPCAP_REG_CRM_ICHRG_1A596 CPCAP_REG_CRM_ICHRG(0xe)
#define CPCAP_REG_CRM_ICHRG_NO_LIMIT CPCAP_REG_CRM_ICHRG(0xf)
/* CPCAP_REG_VUSBC register bits needed for VBUS */
#define CPCAP_BIT_VBUS_SWITCH BIT(0) /* VBUS boost to 5V */
enum {
CPCAP_CHARGER_IIO_BATTDET,
CPCAP_CHARGER_IIO_VOLTAGE,
CPCAP_CHARGER_IIO_VBUS,
CPCAP_CHARGER_IIO_CHRG_CURRENT,
CPCAP_CHARGER_IIO_BATT_CURRENT,
CPCAP_CHARGER_IIO_NR,
};
struct cpcap_charger_ddata {
struct device *dev;
struct regmap *reg;
struct list_head irq_list;
struct delayed_work detect_work;
struct delayed_work vbus_work;
struct gpio_desc *gpio[2]; /* gpio_reven0 & 1 */
struct iio_channel *channels[CPCAP_CHARGER_IIO_NR];
struct power_supply *usb;
struct phy_companion comparator; /* For USB VBUS */
unsigned int vbus_enabled:1;
unsigned int feeding_vbus:1;
atomic_t active;
int status;
int voltage;
int limit_current;
};
struct cpcap_interrupt_desc {
int irq;
struct list_head node;
const char *name;
};
struct cpcap_charger_ints_state {
bool chrg_det;
bool rvrs_chrg;
bool vbusov;
bool chrg_se1b;
bool rvrs_mode;
bool chrgcurr2;
bool chrgcurr1;
bool vbusvld;
bool battdetb;
};
static enum power_supply_property cpcap_charger_props[] = {
POWER_SUPPLY_PROP_STATUS,
POWER_SUPPLY_PROP_ONLINE,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT,
POWER_SUPPLY_PROP_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static int cpcap_charger_get_charge_voltage(struct cpcap_charger_ddata *ddata)
{
struct iio_channel *channel;
int error, value = 0;
channel = ddata->channels[CPCAP_CHARGER_IIO_VOLTAGE];
error = iio_read_channel_processed(channel, &value);
if (error < 0) {
dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
return 0;
}
return value;
}
static int cpcap_charger_get_charge_current(struct cpcap_charger_ddata *ddata)
{
struct iio_channel *channel;
int error, value = 0;
channel = ddata->channels[CPCAP_CHARGER_IIO_CHRG_CURRENT];
error = iio_read_channel_processed(channel, &value);
if (error < 0) {
dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
return 0;
}
return value;
}
static int cpcap_charger_get_property(struct power_supply *psy,
enum power_supply_property psp,
union power_supply_propval *val)
{
struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
switch (psp) {
case POWER_SUPPLY_PROP_STATUS:
val->intval = ddata->status;
break;
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
val->intval = ddata->limit_current;
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
val->intval = ddata->voltage;
break;
case POWER_SUPPLY_PROP_VOLTAGE_NOW:
if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
val->intval = cpcap_charger_get_charge_voltage(ddata) *
1000;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_CURRENT_NOW:
if (ddata->status == POWER_SUPPLY_STATUS_CHARGING)
val->intval = cpcap_charger_get_charge_current(ddata) *
1000;
else
val->intval = 0;
break;
case POWER_SUPPLY_PROP_ONLINE:
val->intval = ddata->status == POWER_SUPPLY_STATUS_CHARGING;
break;
default:
return -EINVAL;
}
return 0;
}
static int cpcap_charger_match_voltage(int voltage)
{
switch (voltage) {
case 0 ... 4100000 - 1: return 3800000;
case 4100000 ... 4120000 - 1: return 4100000;
case 4120000 ... 4150000 - 1: return 4120000;
case 4150000 ... 4170000 - 1: return 4150000;
case 4170000 ... 4200000 - 1: return 4170000;
case 4200000 ... 4230000 - 1: return 4200000;
case 4230000 ... 4250000 - 1: return 4230000;
case 4250000 ... 4270000 - 1: return 4250000;
case 4270000 ... 4300000 - 1: return 4270000;
case 4300000 ... 4330000 - 1: return 4300000;
case 4330000 ... 4350000 - 1: return 4330000;
case 4350000 ... 4380000 - 1: return 4350000;
case 4380000 ... 4400000 - 1: return 4380000;
case 4400000 ... 4420000 - 1: return 4400000;
case 4420000 ... 4440000 - 1: return 4420000;
case 4440000: return 4440000;
default: return 0;
}
}
static int
cpcap_charger_get_bat_const_charge_voltage(struct cpcap_charger_ddata *ddata)
{
union power_supply_propval prop;
struct power_supply *battery;
int voltage = ddata->voltage;
int error;
battery = power_supply_get_by_name("battery");
if (battery) {
error = power_supply_get_property(battery,
POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE,
&prop);
if (!error)
voltage = prop.intval;
power_supply_put(battery);
}
return voltage;
}
static int cpcap_charger_current_to_regval(int microamp)
{
int miliamp = microamp / 1000;
int res;
if (miliamp < 0)
return -EINVAL;
if (miliamp < 70)
return CPCAP_REG_CRM_ICHRG(0x0);
if (miliamp < 177)
return CPCAP_REG_CRM_ICHRG(0x1);
if (miliamp >= 1596)
return CPCAP_REG_CRM_ICHRG(0xe);
res = microamp / 88666;
if (res > 0xd)
res = 0xd;
return CPCAP_REG_CRM_ICHRG(res);
}
static int cpcap_charger_set_property(struct power_supply *psy,
enum power_supply_property psp,
const union power_supply_propval *val)
{
struct cpcap_charger_ddata *ddata = dev_get_drvdata(psy->dev.parent);
int voltage, batvolt;
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
if (cpcap_charger_current_to_regval(val->intval) < 0)
return -EINVAL;
ddata->limit_current = val->intval;
schedule_delayed_work(&ddata->detect_work, 0);
break;
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
voltage = cpcap_charger_match_voltage(val->intval);
batvolt = cpcap_charger_get_bat_const_charge_voltage(ddata);
if (voltage > batvolt)
voltage = batvolt;
ddata->voltage = voltage;
schedule_delayed_work(&ddata->detect_work, 0);
break;
default:
return -EINVAL;
}
return 0;
}
static int cpcap_charger_property_is_writeable(struct power_supply *psy,
enum power_supply_property psp)
{
switch (psp) {
case POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT:
case POWER_SUPPLY_PROP_CONSTANT_CHARGE_VOLTAGE:
return 1;
default:
return 0;
}
}
static void cpcap_charger_set_cable_path(struct cpcap_charger_ddata *ddata,
bool enabled)
{
if (!ddata->gpio[0])
return;
gpiod_set_value(ddata->gpio[0], enabled);
}
static void cpcap_charger_set_inductive_path(struct cpcap_charger_ddata *ddata,
bool enabled)
{
if (!ddata->gpio[1])
return;
gpiod_set_value(ddata->gpio[1], enabled);
}
static void cpcap_charger_update_state(struct cpcap_charger_ddata *ddata,
int state)
{
const char *status;
if (state > POWER_SUPPLY_STATUS_FULL) {
dev_warn(ddata->dev, "unknown state: %i\n", state);
return;
}
ddata->status = state;
switch (state) {
case POWER_SUPPLY_STATUS_DISCHARGING:
status = "DISCONNECTED";
break;
case POWER_SUPPLY_STATUS_NOT_CHARGING:
status = "DETECTING";
break;
case POWER_SUPPLY_STATUS_CHARGING:
status = "CHARGING";
break;
case POWER_SUPPLY_STATUS_FULL:
status = "DONE";
break;
default:
return;
}
dev_dbg(ddata->dev, "state: %s\n", status);
}
static int cpcap_charger_disable(struct cpcap_charger_ddata *ddata)
{
int error;
error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
CPCAP_REG_CRM_FET_OVRD |
CPCAP_REG_CRM_FET_CTRL);
if (error)
dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
return error;
}
static int cpcap_charger_enable(struct cpcap_charger_ddata *ddata,
int max_voltage, int charge_current,
int trickle_current)
{
int error;
if (!max_voltage || !charge_current)
return -EINVAL;
dev_dbg(ddata->dev, "enable: %i %i %i\n",
max_voltage, charge_current, trickle_current);
error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM, 0x3fff,
CPCAP_REG_CRM_CHRG_LED_EN |
trickle_current |
CPCAP_REG_CRM_FET_OVRD |
CPCAP_REG_CRM_FET_CTRL |
max_voltage |
charge_current);
if (error)
dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
return error;
}
static bool cpcap_charger_vbus_valid(struct cpcap_charger_ddata *ddata)
{
int error, value = 0;
struct iio_channel *channel =
ddata->channels[CPCAP_CHARGER_IIO_VBUS];
error = iio_read_channel_processed(channel, &value);
if (error >= 0)
return value > 3900;
dev_err(ddata->dev, "error reading VBUS: %i\n", error);
return false;
}
/* VBUS control functions for the USB PHY companion */
static void cpcap_charger_vbus_work(struct work_struct *work)
{
struct cpcap_charger_ddata *ddata;
bool vbus = false;
int error;
ddata = container_of(work, struct cpcap_charger_ddata,
vbus_work.work);
if (ddata->vbus_enabled) {
vbus = cpcap_charger_vbus_valid(ddata);
if (vbus) {
dev_dbg(ddata->dev, "VBUS already provided\n");
return;
}
ddata->feeding_vbus = true;
cpcap_charger_set_cable_path(ddata, false);
cpcap_charger_set_inductive_path(ddata, false);
error = cpcap_charger_disable(ddata);
if (error)
goto out_err;
cpcap_charger_update_state(ddata,
POWER_SUPPLY_STATUS_DISCHARGING);
error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
CPCAP_BIT_VBUS_SWITCH,
CPCAP_BIT_VBUS_SWITCH);
if (error)
goto out_err;
error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
CPCAP_REG_CRM_RVRSMODE,
CPCAP_REG_CRM_RVRSMODE);
if (error)
goto out_err;
} else {
error = regmap_update_bits(ddata->reg, CPCAP_REG_VUSBC,
CPCAP_BIT_VBUS_SWITCH, 0);
if (error)
goto out_err;
error = regmap_update_bits(ddata->reg, CPCAP_REG_CRM,
CPCAP_REG_CRM_RVRSMODE, 0);
if (error)
goto out_err;
cpcap_charger_set_cable_path(ddata, true);
cpcap_charger_set_inductive_path(ddata, true);
ddata->feeding_vbus = false;
}
return;
out_err:
cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
dev_err(ddata->dev, "%s could not %s vbus: %i\n", __func__,
ddata->vbus_enabled ? "enable" : "disable", error);
}
static int cpcap_charger_set_vbus(struct phy_companion *comparator,
bool enabled)
{
struct cpcap_charger_ddata *ddata =
container_of(comparator, struct cpcap_charger_ddata,
comparator);
ddata->vbus_enabled = enabled;
schedule_delayed_work(&ddata->vbus_work, 0);
return 0;
}
/* Charger interrupt handling functions */
static int cpcap_charger_get_ints_state(struct cpcap_charger_ddata *ddata,
struct cpcap_charger_ints_state *s)
{
int val, error;
error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
if (error)
return error;
s->chrg_det = val & BIT(13);
s->rvrs_chrg = val & BIT(12);
s->vbusov = val & BIT(11);
error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
if (error)
return error;
s->chrg_se1b = val & BIT(13);
s->rvrs_mode = val & BIT(6);
s->chrgcurr2 = val & BIT(5);
s->chrgcurr1 = val & BIT(4);
s->vbusvld = val & BIT(3);
error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
if (error)
return error;
s->battdetb = val & BIT(6);
return 0;
}
static int cpcap_charger_voltage_to_regval(int voltage)
{
int offset;
switch (voltage) {
case 0 ... 4100000 - 1:
return 0;
case 4100000 ... 4200000 - 1:
offset = 1;
break;
case 4200000 ... 4300000 - 1:
offset = 0;
break;
case 4300000 ... 4380000 - 1:
offset = -1;
break;
case 4380000 ... 4440000:
offset = -2;
break;
default:
return 0;
}
return ((voltage - 4100000) / 20000) + offset;
}
static void cpcap_charger_disconnect(struct cpcap_charger_ddata *ddata,
int state, unsigned long delay)
{
int error;
/* Update battery state before disconnecting the charger */
switch (state) {
case POWER_SUPPLY_STATUS_DISCHARGING:
case POWER_SUPPLY_STATUS_FULL:
power_supply_changed(ddata->usb);
break;
default:
break;
}
error = cpcap_charger_disable(ddata);
if (error) {
cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
return;
}
cpcap_charger_update_state(ddata, state);
power_supply_changed(ddata->usb);
schedule_delayed_work(&ddata->detect_work, delay);
}
static void cpcap_usb_detect(struct work_struct *work)
{
struct cpcap_charger_ddata *ddata;
struct cpcap_charger_ints_state s;
int error, new_state;
ddata = container_of(work, struct cpcap_charger_ddata,
detect_work.work);
error = cpcap_charger_get_ints_state(ddata, &s);
if (error)
return;
/* Just init the state if a charger is connected with no chrg_det set */
if (!s.chrg_det && s.chrgcurr1 && s.vbusvld) {
cpcap_charger_update_state(ddata,
POWER_SUPPLY_STATUS_NOT_CHARGING);
return;
}
/*
* If battery voltage is higher than charge voltage, it may have been
* charged to 4.35V by Android. Try again in 10 minutes.
*/
if (cpcap_charger_get_charge_voltage(ddata) > ddata->voltage) {
cpcap_charger_disconnect(ddata,
POWER_SUPPLY_STATUS_NOT_CHARGING,
HZ * 60 * 10);
return;
}
/* Delay for 80ms to avoid vbus bouncing when usb cable is plugged in */
usleep_range(80000, 120000);
/* Throttle chrgcurr2 interrupt for charger done and retry */
switch (ddata->status) {
case POWER_SUPPLY_STATUS_CHARGING:
if (s.chrgcurr2)
break;
new_state = POWER_SUPPLY_STATUS_FULL;
if (s.chrgcurr1 && s.vbusvld) {
cpcap_charger_disconnect(ddata, new_state, HZ * 5);
return;
}
break;
case POWER_SUPPLY_STATUS_FULL:
if (!s.chrgcurr2)
break;
if (s.vbusvld)
new_state = POWER_SUPPLY_STATUS_NOT_CHARGING;
else
new_state = POWER_SUPPLY_STATUS_DISCHARGING;
cpcap_charger_disconnect(ddata, new_state, HZ * 5);
return;
default:
break;
}
if (!ddata->feeding_vbus && cpcap_charger_vbus_valid(ddata) &&
s.chrgcurr1) {
int max_current;
int vchrg, ichrg;
union power_supply_propval val;
struct power_supply *battery;
battery = power_supply_get_by_name("battery");
if (IS_ERR_OR_NULL(battery)) {
dev_err(ddata->dev, "battery power_supply not available %li\n",
PTR_ERR(battery));
return;
}
error = power_supply_get_property(battery, POWER_SUPPLY_PROP_PRESENT, &val);
power_supply_put(battery);
if (error)
goto out_err;
if (val.intval) {
max_current = 1596000;
} else {
dev_info(ddata->dev, "battery not inserted, charging disabled\n");
max_current = 0;
}
if (max_current > ddata->limit_current)
max_current = ddata->limit_current;
ichrg = cpcap_charger_current_to_regval(max_current);
vchrg = cpcap_charger_voltage_to_regval(ddata->voltage);
error = cpcap_charger_enable(ddata,
CPCAP_REG_CRM_VCHRG(vchrg),
ichrg, 0);
if (error)
goto out_err;
cpcap_charger_update_state(ddata,
POWER_SUPPLY_STATUS_CHARGING);
} else {
error = cpcap_charger_disable(ddata);
if (error)
goto out_err;
cpcap_charger_update_state(ddata,
POWER_SUPPLY_STATUS_DISCHARGING);
}
power_supply_changed(ddata->usb);
return;
out_err:
cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
}
static irqreturn_t cpcap_charger_irq_thread(int irq, void *data)
{
struct cpcap_charger_ddata *ddata = data;
if (!atomic_read(&ddata->active))
return IRQ_NONE;
schedule_delayed_work(&ddata->detect_work, 0);
return IRQ_HANDLED;
}
static int cpcap_usb_init_irq(struct platform_device *pdev,
struct cpcap_charger_ddata *ddata,
const char *name)
{
struct cpcap_interrupt_desc *d;
int irq, error;
irq = platform_get_irq_byname(pdev, name);
if (irq < 0)
return -ENODEV;
error = devm_request_threaded_irq(ddata->dev, irq, NULL,
cpcap_charger_irq_thread,
IRQF_SHARED | IRQF_ONESHOT,
name, ddata);
if (error) {
dev_err(ddata->dev, "could not get irq %s: %i\n",
name, error);
return error;
}
d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
if (!d)
return -ENOMEM;
d->name = name;
d->irq = irq;
list_add(&d->node, &ddata->irq_list);
return 0;
}
static const char * const cpcap_charger_irqs[] = {
/* REG_INT_0 */
"chrg_det", "rvrs_chrg",
/* REG_INT1 */
"chrg_se1b", "se0conn", "rvrs_mode", "chrgcurr2", "chrgcurr1", "vbusvld",
/* REG_INT_3 */
"battdetb",
};
static int cpcap_usb_init_interrupts(struct platform_device *pdev,
struct cpcap_charger_ddata *ddata)
{
int i, error;
for (i = 0; i < ARRAY_SIZE(cpcap_charger_irqs); i++) {
error = cpcap_usb_init_irq(pdev, ddata, cpcap_charger_irqs[i]);
if (error)
return error;
}
return 0;
}
static void cpcap_charger_init_optional_gpios(struct cpcap_charger_ddata *ddata)
{
int i;
for (i = 0; i < 2; i++) {
ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
i, GPIOD_OUT_HIGH);
if (IS_ERR(ddata->gpio[i])) {
dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
i, PTR_ERR(ddata->gpio[i]));
ddata->gpio[i] = NULL;
}
}
}
static int cpcap_charger_init_iio(struct cpcap_charger_ddata *ddata)
{
const char * const names[CPCAP_CHARGER_IIO_NR] = {
"battdetb", "battp", "vbus", "chg_isense", "batti",
};
int error, i;
for (i = 0; i < CPCAP_CHARGER_IIO_NR; i++) {
ddata->channels[i] = devm_iio_channel_get(ddata->dev,
names[i]);
if (IS_ERR(ddata->channels[i])) {
error = PTR_ERR(ddata->channels[i]);
goto out_err;
}
if (!ddata->channels[i]->indio_dev) {
error = -ENXIO;
goto out_err;
}
}
return 0;
out_err:
if (error != -EPROBE_DEFER)
dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
error);
return error;
}
static char *cpcap_charger_supplied_to[] = {
"battery",
};
static const struct power_supply_desc cpcap_charger_usb_desc = {
.name = "usb",
.type = POWER_SUPPLY_TYPE_USB,
.properties = cpcap_charger_props,
.num_properties = ARRAY_SIZE(cpcap_charger_props),
.get_property = cpcap_charger_get_property,
.set_property = cpcap_charger_set_property,
.property_is_writeable = cpcap_charger_property_is_writeable,
};
#ifdef CONFIG_OF
static const struct of_device_id cpcap_charger_id_table[] = {
{
.compatible = "motorola,mapphone-cpcap-charger",
},
{},
};
MODULE_DEVICE_TABLE(of, cpcap_charger_id_table);
#endif
static int cpcap_charger_probe(struct platform_device *pdev)
{
struct cpcap_charger_ddata *ddata;
const struct of_device_id *of_id;
struct power_supply_config psy_cfg = {};
int error;
of_id = of_match_device(of_match_ptr(cpcap_charger_id_table),
&pdev->dev);
if (!of_id)
return -EINVAL;
ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
if (!ddata)
return -ENOMEM;
ddata->dev = &pdev->dev;
ddata->voltage = 4200000;
ddata->limit_current = 532000;
ddata->reg = dev_get_regmap(ddata->dev->parent, NULL);
if (!ddata->reg)
return -ENODEV;
INIT_LIST_HEAD(&ddata->irq_list);
INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
INIT_DELAYED_WORK(&ddata->vbus_work, cpcap_charger_vbus_work);
platform_set_drvdata(pdev, ddata);
error = cpcap_charger_init_iio(ddata);
if (error)
return error;
atomic_set(&ddata->active, 1);
psy_cfg.of_node = pdev->dev.of_node;
psy_cfg.drv_data = ddata;
psy_cfg.supplied_to = cpcap_charger_supplied_to;
psy_cfg.num_supplicants = ARRAY_SIZE(cpcap_charger_supplied_to),
ddata->usb = devm_power_supply_register(ddata->dev,
&cpcap_charger_usb_desc,
&psy_cfg);
if (IS_ERR(ddata->usb)) {
error = PTR_ERR(ddata->usb);
dev_err(ddata->dev, "failed to register USB charger: %i\n",
error);
return error;
}
error = cpcap_usb_init_interrupts(pdev, ddata);
if (error)
return error;
ddata->comparator.set_vbus = cpcap_charger_set_vbus;
error = omap_usb2_set_comparator(&ddata->comparator);
if (error == -ENODEV) {
dev_info(ddata->dev, "charger needs phy, deferring probe\n");
return -EPROBE_DEFER;
}
cpcap_charger_init_optional_gpios(ddata);
schedule_delayed_work(&ddata->detect_work, 0);
return 0;
}
static void cpcap_charger_shutdown(struct platform_device *pdev)
{
struct cpcap_charger_ddata *ddata = platform_get_drvdata(pdev);
int error;
atomic_set(&ddata->active, 0);
error = omap_usb2_set_comparator(NULL);
if (error)
dev_warn(ddata->dev, "could not clear USB comparator: %i\n",
error);
error = cpcap_charger_disable(ddata);
if (error) {
cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_UNKNOWN);
dev_warn(ddata->dev, "could not clear charger: %i\n",
error);
}
cpcap_charger_update_state(ddata, POWER_SUPPLY_STATUS_DISCHARGING);
cancel_delayed_work_sync(&ddata->vbus_work);
cancel_delayed_work_sync(&ddata->detect_work);
}
static int cpcap_charger_remove(struct platform_device *pdev)
{
cpcap_charger_shutdown(pdev);
return 0;
}
static struct platform_driver cpcap_charger_driver = {
.probe = cpcap_charger_probe,
.driver = {
.name = "cpcap-charger",
.of_match_table = of_match_ptr(cpcap_charger_id_table),
},
.shutdown = cpcap_charger_shutdown,
.remove = cpcap_charger_remove,
};
module_platform_driver(cpcap_charger_driver);
MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
MODULE_DESCRIPTION("CPCAP Battery Charger Interface driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:cpcap-charger");