// SPDX-License-Identifier: GPL-2.0+
//
// extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
//
// Copyright (C) 2012 Samsung Electronics
// Donggeun Kim <[email protected]>
#include <linux/devm-helpers.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/kobject.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
#include <linux/extcon-provider.h>
#include <linux/irqdomain.h>
#define DEV_NAME "max8997-muic"
#define DELAY_MS_DEFAULT 20000 /* unit: millisecond */
enum max8997_muic_adc_debounce_time {
ADC_DEBOUNCE_TIME_0_5MS = 0, /* 0.5ms */
ADC_DEBOUNCE_TIME_10MS, /* 10ms */
ADC_DEBOUNCE_TIME_25MS, /* 25ms */
ADC_DEBOUNCE_TIME_38_62MS, /* 38.62ms */
};
struct max8997_muic_irq {
unsigned int irq;
const char *name;
unsigned int virq;
};
static struct max8997_muic_irq muic_irqs[] = {
{ MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" },
{ MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" },
{ MAX8997_MUICIRQ_ADC, "muic-ADC" },
{ MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" },
{ MAX8997_MUICIRQ_DBChg, "muic-DBCHG" },
{ MAX8997_MUICIRQ_DCDTmr, "muic-DCDTMR" },
{ MAX8997_MUICIRQ_ChgDetRun, "muic-CHGDETRUN" },
{ MAX8997_MUICIRQ_ChgTyp, "muic-CHGTYP" },
{ MAX8997_MUICIRQ_OVP, "muic-OVP" },
{ MAX8997_PMICIRQ_CHGINS, "pmic-CHGINS" },
{ MAX8997_PMICIRQ_CHGRM, "pmic-CHGRM" },
};
/* Define supported cable type */
enum max8997_muic_acc_type {
MAX8997_MUIC_ADC_GROUND = 0x0,
MAX8997_MUIC_ADC_MHL, /* MHL*/
MAX8997_MUIC_ADC_REMOTE_S1_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S2_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S3_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S4_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S5_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S6_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S7_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S8_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S9_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S10_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S11_BUTTON,
MAX8997_MUIC_ADC_REMOTE_S12_BUTTON,
MAX8997_MUIC_ADC_RESERVED_ACC_1,
MAX8997_MUIC_ADC_RESERVED_ACC_2,
MAX8997_MUIC_ADC_RESERVED_ACC_3,
MAX8997_MUIC_ADC_RESERVED_ACC_4,
MAX8997_MUIC_ADC_RESERVED_ACC_5,
MAX8997_MUIC_ADC_CEA936_AUDIO,
MAX8997_MUIC_ADC_PHONE_POWERED_DEV,
MAX8997_MUIC_ADC_TTY_CONVERTER,
MAX8997_MUIC_ADC_UART_CABLE,
MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG,
MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF, /* JIG-USB-OFF */
MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON, /* JIG-USB-ON */
MAX8997_MUIC_ADC_AV_CABLE_NOLOAD, /* DESKDOCK */
MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG,
MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF, /* JIG-UART */
MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON, /* CARDOCK */
MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE,
MAX8997_MUIC_ADC_OPEN, /* OPEN */
};
enum max8997_muic_cable_group {
MAX8997_CABLE_GROUP_ADC = 0,
MAX8997_CABLE_GROUP_ADC_GND,
MAX8997_CABLE_GROUP_CHG,
MAX8997_CABLE_GROUP_VBVOLT,
};
enum max8997_muic_usb_type {
MAX8997_USB_HOST,
MAX8997_USB_DEVICE,
};
enum max8997_muic_charger_type {
MAX8997_CHARGER_TYPE_NONE = 0,
MAX8997_CHARGER_TYPE_USB,
MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT,
MAX8997_CHARGER_TYPE_DEDICATED_CHG,
MAX8997_CHARGER_TYPE_500MA,
MAX8997_CHARGER_TYPE_1A,
MAX8997_CHARGER_TYPE_DEAD_BATTERY = 7,
};
struct max8997_muic_info {
struct device *dev;
struct i2c_client *muic;
struct extcon_dev *edev;
int prev_cable_type;
int prev_chg_type;
u8 status[2];
int irq;
struct work_struct irq_work;
struct mutex mutex;
struct max8997_muic_platform_data *muic_pdata;
enum max8997_muic_charger_type pre_charger_type;
/*
* Use delayed workqueue to detect cable state and then
* notify cable state to notifiee/platform through uevent.
* After completing the booting of platform, the extcon provider
* driver should notify cable state to upper layer.
*/
struct delayed_work wq_detcable;
/*
* Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
* h/w path of COMP2/COMN1 on CONTROL1 register.
*/
int path_usb;
int path_uart;
};
static const unsigned int max8997_extcon_cable[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_CHG_USB_SDP,
EXTCON_CHG_USB_DCP,
EXTCON_CHG_USB_FAST,
EXTCON_CHG_USB_SLOW,
EXTCON_CHG_USB_CDP,
EXTCON_DISP_MHL,
EXTCON_DOCK,
EXTCON_JIG,
EXTCON_NONE,
};
/*
* max8997_muic_set_debounce_time - Set the debounce time of ADC
* @info: the instance including private data of max8997 MUIC
* @time: the debounce time of ADC
*/
static int max8997_muic_set_debounce_time(struct max8997_muic_info *info,
enum max8997_muic_adc_debounce_time time)
{
int ret;
switch (time) {
case ADC_DEBOUNCE_TIME_0_5MS:
case ADC_DEBOUNCE_TIME_10MS:
case ADC_DEBOUNCE_TIME_25MS:
case ADC_DEBOUNCE_TIME_38_62MS:
ret = max8997_update_reg(info->muic,
MAX8997_MUIC_REG_CONTROL3,
time << CONTROL3_ADCDBSET_SHIFT,
CONTROL3_ADCDBSET_MASK);
if (ret) {
dev_err(info->dev, "failed to set ADC debounce time\n");
return ret;
}
break;
default:
dev_err(info->dev, "invalid ADC debounce time\n");
return -EINVAL;
}
return 0;
};
/*
* max8997_muic_set_path - Set hardware line according to attached cable
* @info: the instance including private data of max8997 MUIC
* @value: the path according to attached cable
* @attached: the state of cable (true:attached, false:detached)
*
* The max8997 MUIC device share outside H/W line among a varity of cables,
* so this function set internal path of H/W line according to the type of
* attached cable.
*/
static int max8997_muic_set_path(struct max8997_muic_info *info,
u8 val, bool attached)
{
int ret;
u8 ctrl1, ctrl2 = 0;
if (attached)
ctrl1 = val;
else
ctrl1 = CONTROL1_SW_OPEN;
ret = max8997_update_reg(info->muic,
MAX8997_MUIC_REG_CONTROL1, ctrl1, COMP_SW_MASK);
if (ret < 0) {
dev_err(info->dev, "failed to update MUIC register\n");
return ret;
}
if (attached)
ctrl2 |= CONTROL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
else
ctrl2 |= CONTROL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
ret = max8997_update_reg(info->muic,
MAX8997_MUIC_REG_CONTROL2, ctrl2,
CONTROL2_LOWPWR_MASK | CONTROL2_CPEN_MASK);
if (ret < 0) {
dev_err(info->dev, "failed to update MUIC register\n");
return ret;
}
dev_info(info->dev,
"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
ctrl1, ctrl2, attached ? "attached" : "detached");
return 0;
}
/*
* max8997_muic_get_cable_type - Return cable type and check cable state
* @info: the instance including private data of max8997 MUIC
* @group: the path according to attached cable
* @attached: store cable state and return
*
* This function check the cable state either attached or detached,
* and then divide precise type of cable according to cable group.
* - MAX8997_CABLE_GROUP_ADC
* - MAX8997_CABLE_GROUP_CHG
*/
static int max8997_muic_get_cable_type(struct max8997_muic_info *info,
enum max8997_muic_cable_group group, bool *attached)
{
int cable_type = 0;
int adc;
int chg_type;
switch (group) {
case MAX8997_CABLE_GROUP_ADC:
/*
* Read ADC value to check cable type and decide cable state
* according to cable type
*/
adc = info->status[0] & STATUS1_ADC_MASK;
adc >>= STATUS1_ADC_SHIFT;
/*
* Check current cable state/cable type and store cable type
* (info->prev_cable_type) for handling cable when cable is
* detached.
*/
if (adc == MAX8997_MUIC_ADC_OPEN) {
*attached = false;
cable_type = info->prev_cable_type;
info->prev_cable_type = MAX8997_MUIC_ADC_OPEN;
} else {
*attached = true;
cable_type = info->prev_cable_type = adc;
}
break;
case MAX8997_CABLE_GROUP_CHG:
/*
* Read charger type to check cable type and decide cable state
* according to type of charger cable.
*/
chg_type = info->status[1] & STATUS2_CHGTYP_MASK;
chg_type >>= STATUS2_CHGTYP_SHIFT;
if (chg_type == MAX8997_CHARGER_TYPE_NONE) {
*attached = false;
cable_type = info->prev_chg_type;
info->prev_chg_type = MAX8997_CHARGER_TYPE_NONE;
} else {
*attached = true;
/*
* Check current cable state/cable type and store cable
* type(info->prev_chg_type) for handling cable when
* charger cable is detached.
*/
cable_type = info->prev_chg_type = chg_type;
}
break;
default:
dev_err(info->dev, "Unknown cable group (%d)\n", group);
cable_type = -EINVAL;
break;
}
return cable_type;
}
static int max8997_muic_handle_usb(struct max8997_muic_info *info,
enum max8997_muic_usb_type usb_type, bool attached)
{
int ret = 0;
ret = max8997_muic_set_path(info, info->path_usb, attached);
if (ret < 0) {
dev_err(info->dev, "failed to update muic register\n");
return ret;
}
switch (usb_type) {
case MAX8997_USB_HOST:
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
break;
case MAX8997_USB_DEVICE:
extcon_set_state_sync(info->edev, EXTCON_USB, attached);
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
attached);
break;
default:
dev_err(info->dev, "failed to detect %s usb cable\n",
attached ? "attached" : "detached");
return -EINVAL;
}
return 0;
}
static int max8997_muic_handle_dock(struct max8997_muic_info *info,
int cable_type, bool attached)
{
int ret = 0;
ret = max8997_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
if (ret) {
dev_err(info->dev, "failed to update muic register\n");
return ret;
}
switch (cable_type) {
case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
break;
default:
dev_err(info->dev, "failed to detect %s dock device\n",
attached ? "attached" : "detached");
return -EINVAL;
}
return 0;
}
static int max8997_muic_handle_jig_uart(struct max8997_muic_info *info,
bool attached)
{
int ret = 0;
/* switch to UART */
ret = max8997_muic_set_path(info, info->path_uart, attached);
if (ret) {
dev_err(info->dev, "failed to update muic register\n");
return ret;
}
extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
return 0;
}
static int max8997_muic_adc_handler(struct max8997_muic_info *info)
{
int cable_type;
bool attached;
int ret = 0;
/* Check cable state which is either detached or attached */
cable_type = max8997_muic_get_cable_type(info,
MAX8997_CABLE_GROUP_ADC, &attached);
switch (cable_type) {
case MAX8997_MUIC_ADC_GROUND:
ret = max8997_muic_handle_usb(info, MAX8997_USB_HOST, attached);
if (ret < 0)
return ret;
break;
case MAX8997_MUIC_ADC_MHL:
extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
break;
case MAX8997_MUIC_ADC_FACTORY_MODE_USB_OFF:
case MAX8997_MUIC_ADC_FACTORY_MODE_USB_ON:
ret = max8997_muic_handle_usb(info,
MAX8997_USB_DEVICE, attached);
if (ret < 0)
return ret;
break;
case MAX8997_MUIC_ADC_AV_CABLE_NOLOAD:
case MAX8997_MUIC_ADC_FACTORY_MODE_UART_ON:
ret = max8997_muic_handle_dock(info, cable_type, attached);
if (ret < 0)
return ret;
break;
case MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF:
ret = max8997_muic_handle_jig_uart(info, attached);
break;
case MAX8997_MUIC_ADC_REMOTE_S1_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S2_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S3_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S4_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S5_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S6_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S7_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S8_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S9_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S10_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S11_BUTTON:
case MAX8997_MUIC_ADC_REMOTE_S12_BUTTON:
case MAX8997_MUIC_ADC_RESERVED_ACC_1:
case MAX8997_MUIC_ADC_RESERVED_ACC_2:
case MAX8997_MUIC_ADC_RESERVED_ACC_3:
case MAX8997_MUIC_ADC_RESERVED_ACC_4:
case MAX8997_MUIC_ADC_RESERVED_ACC_5:
case MAX8997_MUIC_ADC_CEA936_AUDIO:
case MAX8997_MUIC_ADC_PHONE_POWERED_DEV:
case MAX8997_MUIC_ADC_TTY_CONVERTER:
case MAX8997_MUIC_ADC_UART_CABLE:
case MAX8997_MUIC_ADC_CEA936A_TYPE1_CHG:
case MAX8997_MUIC_ADC_CEA936A_TYPE2_CHG:
case MAX8997_MUIC_ADC_AUDIO_MODE_REMOTE:
/*
* This cable isn't used in general case if it is specially
* needed to detect additional cable, should implement
* proper operation when this cable is attached/detached.
*/
dev_info(info->dev,
"cable is %s but it isn't used (type:0x%x)\n",
attached ? "attached" : "detached", cable_type);
return -EAGAIN;
default:
dev_err(info->dev,
"failed to detect %s unknown cable (type:0x%x)\n",
attached ? "attached" : "detached", cable_type);
return -EINVAL;
}
return 0;
}
static int max8997_muic_chg_handler(struct max8997_muic_info *info)
{
int chg_type;
bool attached;
int adc;
chg_type = max8997_muic_get_cable_type(info,
MAX8997_CABLE_GROUP_CHG, &attached);
switch (chg_type) {
case MAX8997_CHARGER_TYPE_NONE:
break;
case MAX8997_CHARGER_TYPE_USB:
adc = info->status[0] & STATUS1_ADC_MASK;
adc >>= STATUS1_ADC_SHIFT;
if ((adc & STATUS1_ADC_MASK) == MAX8997_MUIC_ADC_OPEN) {
max8997_muic_handle_usb(info,
MAX8997_USB_DEVICE, attached);
}
break;
case MAX8997_CHARGER_TYPE_DOWNSTREAM_PORT:
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
attached);
break;
case MAX8997_CHARGER_TYPE_DEDICATED_CHG:
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
attached);
break;
case MAX8997_CHARGER_TYPE_500MA:
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
attached);
break;
case MAX8997_CHARGER_TYPE_1A:
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
attached);
break;
default:
dev_err(info->dev,
"failed to detect %s unknown chg cable (type:0x%x)\n",
attached ? "attached" : "detached", chg_type);
return -EINVAL;
}
return 0;
}
static void max8997_muic_irq_work(struct work_struct *work)
{
struct max8997_muic_info *info = container_of(work,
struct max8997_muic_info, irq_work);
int irq_type = 0;
int i, ret;
if (!info->edev)
return;
mutex_lock(&info->mutex);
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
if (info->irq == muic_irqs[i].virq)
irq_type = muic_irqs[i].irq;
ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
2, info->status);
if (ret) {
dev_err(info->dev, "failed to read muic register\n");
mutex_unlock(&info->mutex);
return;
}
switch (irq_type) {
case MAX8997_MUICIRQ_ADCError:
case MAX8997_MUICIRQ_ADCLow:
case MAX8997_MUICIRQ_ADC:
/* Handle all of cable except for charger cable */
ret = max8997_muic_adc_handler(info);
break;
case MAX8997_MUICIRQ_VBVolt:
case MAX8997_MUICIRQ_DBChg:
case MAX8997_MUICIRQ_DCDTmr:
case MAX8997_MUICIRQ_ChgDetRun:
case MAX8997_MUICIRQ_ChgTyp:
case MAX8997_PMICIRQ_CHGINS:
case MAX8997_PMICIRQ_CHGRM:
/* Handle charger cable */
ret = max8997_muic_chg_handler(info);
break;
case MAX8997_MUICIRQ_OVP:
break;
default:
dev_info(info->dev, "misc interrupt: irq %d occurred\n",
irq_type);
mutex_unlock(&info->mutex);
return;
}
if (ret < 0)
dev_err(info->dev, "failed to handle MUIC interrupt\n");
mutex_unlock(&info->mutex);
}
static irqreturn_t max8997_muic_irq_handler(int irq, void *data)
{
struct max8997_muic_info *info = data;
dev_dbg(info->dev, "irq:%d\n", irq);
info->irq = irq;
schedule_work(&info->irq_work);
return IRQ_HANDLED;
}
static int max8997_muic_detect_dev(struct max8997_muic_info *info)
{
int ret = 0;
int adc;
int chg_type;
bool attached;
mutex_lock(&info->mutex);
/* Read STATUSx register to detect accessory */
ret = max8997_bulk_read(info->muic,
MAX8997_MUIC_REG_STATUS1, 2, info->status);
if (ret) {
dev_err(info->dev, "failed to read MUIC register\n");
mutex_unlock(&info->mutex);
return ret;
}
adc = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_ADC,
&attached);
if (attached && adc != MAX8997_MUIC_ADC_OPEN) {
ret = max8997_muic_adc_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect ADC cable\n");
mutex_unlock(&info->mutex);
return ret;
}
}
chg_type = max8997_muic_get_cable_type(info, MAX8997_CABLE_GROUP_CHG,
&attached);
if (attached && chg_type != MAX8997_CHARGER_TYPE_NONE) {
ret = max8997_muic_chg_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect charger cable\n");
mutex_unlock(&info->mutex);
return ret;
}
}
mutex_unlock(&info->mutex);
return 0;
}
static void max8997_muic_detect_cable_wq(struct work_struct *work)
{
struct max8997_muic_info *info = container_of(to_delayed_work(work),
struct max8997_muic_info, wq_detcable);
int ret;
ret = max8997_muic_detect_dev(info);
if (ret < 0)
dev_err(info->dev, "failed to detect cable type\n");
}
static int max8997_muic_probe(struct platform_device *pdev)
{
struct max8997_dev *max8997 = dev_get_drvdata(pdev->dev.parent);
struct max8997_platform_data *pdata = dev_get_platdata(max8997->dev);
struct max8997_muic_info *info;
int delay_jiffies;
int cable_type;
bool attached;
int ret, i;
info = devm_kzalloc(&pdev->dev, sizeof(struct max8997_muic_info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &pdev->dev;
info->muic = max8997->muic;
platform_set_drvdata(pdev, info);
mutex_init(&info->mutex);
INIT_WORK(&info->irq_work, max8997_muic_irq_work);
ret = devm_work_autocancel(&pdev->dev, &info->irq_work,
max8997_muic_irq_work);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
struct max8997_muic_irq *muic_irq = &muic_irqs[i];
unsigned int virq = 0;
virq = irq_create_mapping(max8997->irq_domain, muic_irq->irq);
if (!virq)
return -EINVAL;
muic_irq->virq = virq;
ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
max8997_muic_irq_handler,
IRQF_NO_SUSPEND,
muic_irq->name, info);
if (ret) {
dev_err(&pdev->dev,
"failed: irq request (IRQ: %d, error :%d)\n",
muic_irq->irq, ret);
return ret;
}
}
/* External connector */
info->edev = devm_extcon_dev_allocate(&pdev->dev, max8997_extcon_cable);
if (IS_ERR(info->edev)) {
dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
return PTR_ERR(info->edev);
}
ret = devm_extcon_dev_register(&pdev->dev, info->edev);
if (ret) {
dev_err(&pdev->dev, "failed to register extcon device\n");
return ret;
}
if (pdata && pdata->muic_pdata) {
struct max8997_muic_platform_data *muic_pdata
= pdata->muic_pdata;
/* Initialize registers according to platform data */
for (i = 0; i < muic_pdata->num_init_data; i++) {
max8997_write_reg(info->muic,
muic_pdata->init_data[i].addr,
muic_pdata->init_data[i].data);
}
/*
* Default usb/uart path whether UART/USB or AUX_UART/AUX_USB
* h/w path of COMP2/COMN1 on CONTROL1 register.
*/
if (muic_pdata->path_uart)
info->path_uart = muic_pdata->path_uart;
else
info->path_uart = CONTROL1_SW_UART;
if (muic_pdata->path_usb)
info->path_usb = muic_pdata->path_usb;
else
info->path_usb = CONTROL1_SW_USB;
/*
* Default delay time for detecting cable state
* after certain time.
*/
if (muic_pdata->detcable_delay_ms)
delay_jiffies =
msecs_to_jiffies(muic_pdata->detcable_delay_ms);
else
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
} else {
info->path_uart = CONTROL1_SW_UART;
info->path_usb = CONTROL1_SW_USB;
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
}
/* Set initial path for UART when JIG is connected to get serial logs */
ret = max8997_bulk_read(info->muic, MAX8997_MUIC_REG_STATUS1,
2, info->status);
if (ret) {
dev_err(info->dev, "failed to read MUIC register\n");
return ret;
}
cable_type = max8997_muic_get_cable_type(info,
MAX8997_CABLE_GROUP_ADC, &attached);
if (attached && cable_type == MAX8997_MUIC_ADC_FACTORY_MODE_UART_OFF)
max8997_muic_set_path(info, info->path_uart, true);
/* Set ADC debounce time */
max8997_muic_set_debounce_time(info, ADC_DEBOUNCE_TIME_25MS);
/*
* Detect accessory after completing the initialization of platform
*
* - Use delayed workqueue to detect cable state and then
* notify cable state to notifiee/platform through uevent.
* After completing the booting of platform, the extcon provider
* driver should notify cable state to upper layer.
*/
INIT_DELAYED_WORK(&info->wq_detcable, max8997_muic_detect_cable_wq);
queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
delay_jiffies);
return 0;
}
static struct platform_driver max8997_muic_driver = {
.driver = {
.name = DEV_NAME,
},
.probe = max8997_muic_probe,
};
module_platform_driver(max8997_muic_driver);
MODULE_DESCRIPTION("Maxim MAX8997 Extcon driver");
MODULE_AUTHOR("Donggeun Kim <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:max8997-muic");
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