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// 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.
*/
#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,
};
enum {
CPCAP_CHARGER_DISCONNECTED,
CPCAP_CHARGER_DETECTING,
CPCAP_CHARGER_CHARGING,
CPCAP_CHARGER_DONE,
};
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 state;
int voltage;
};
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_VOLTAGE_NOW,
POWER_SUPPLY_PROP_CURRENT_NOW,
};
static bool cpcap_charger_battery_found(struct cpcap_charger_ddata *ddata)
{
struct iio_channel *channel;
int error, value;
channel = ddata->channels[CPCAP_CHARGER_IIO_BATTDET];
error = iio_read_channel_raw(channel, &value);
if (error < 0) {
dev_warn(ddata->dev, "%s failed: %i\n", __func__, error);
return false;
}
return value == 1;
}
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_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
|