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linux-sg2042/drivers/extcon/extcon-max14577.c

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/*
* extcon-max14577.c - MAX14577 extcon driver to support MAX14577 MUIC
*
* Copyright (C) 2013 Samsung Electrnoics
* Chanwoo Choi <cw00.choi@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/mfd/max14577.h>
#include <linux/mfd/max14577-private.h>
#include <linux/extcon.h>
#define DEV_NAME "max14577-muic"
#define DELAY_MS_DEFAULT 17000 /* unit: millisecond */
enum max14577_muic_adc_debounce_time {
ADC_DEBOUNCE_TIME_5MS = 0,
ADC_DEBOUNCE_TIME_10MS,
ADC_DEBOUNCE_TIME_25MS,
ADC_DEBOUNCE_TIME_38_62MS,
};
enum max14577_muic_status {
MAX14577_MUIC_STATUS1 = 0,
MAX14577_MUIC_STATUS2 = 1,
MAX14577_MUIC_STATUS_END,
};
struct max14577_muic_info {
struct device *dev;
struct max14577 *max14577;
struct extcon_dev *edev;
int prev_cable_type;
int prev_chg_type;
u8 status[MAX14577_MUIC_STATUS_END];
bool irq_adc;
bool irq_chg;
struct work_struct irq_work;
struct mutex mutex;
/*
* 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;
};
enum max14577_muic_cable_group {
MAX14577_CABLE_GROUP_ADC = 0,
MAX14577_CABLE_GROUP_CHG,
};
/**
* struct max14577_muic_irq
* @irq: the index of irq list of MUIC device.
* @name: the name of irq.
* @virq: the virtual irq to use irq domain
*/
struct max14577_muic_irq {
unsigned int irq;
const char *name;
unsigned int virq;
};
static struct max14577_muic_irq muic_irqs[] = {
{ MAX14577_IRQ_INT1_ADC, "muic-ADC" },
{ MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
{ MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
{ MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
{ MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
{ MAX14577_IRQ_INT2_DCDTMR, "muic-DCDTMR" },
{ MAX14577_IRQ_INT2_DBCHG, "muic-DBCHG" },
{ MAX14577_IRQ_INT2_VBVOLT, "muic-VBVOLT" },
};
/* Define supported accessory type */
enum max14577_muic_acc_type {
MAX14577_MUIC_ADC_GROUND = 0x0,
MAX14577_MUIC_ADC_SEND_END_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S1_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S2_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S3_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S4_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S5_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S6_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S7_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S8_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S9_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S10_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S11_BUTTON,
MAX14577_MUIC_ADC_REMOTE_S12_BUTTON,
MAX14577_MUIC_ADC_RESERVED_ACC_1,
MAX14577_MUIC_ADC_RESERVED_ACC_2,
MAX14577_MUIC_ADC_RESERVED_ACC_3,
MAX14577_MUIC_ADC_RESERVED_ACC_4,
MAX14577_MUIC_ADC_RESERVED_ACC_5,
MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2,
MAX14577_MUIC_ADC_PHONE_POWERED_DEV,
MAX14577_MUIC_ADC_TTY_CONVERTER,
MAX14577_MUIC_ADC_UART_CABLE,
MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG,
MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF,
MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON,
MAX14577_MUIC_ADC_AV_CABLE_NOLOAD,
MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG,
MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF,
MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON,
MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1, /* with Remote and Simple Ctrl */
MAX14577_MUIC_ADC_OPEN,
};
/* max14577 MUIC device support below list of accessories(external connector) */
enum {
EXTCON_CABLE_USB = 0,
EXTCON_CABLE_TA,
EXTCON_CABLE_FAST_CHARGER,
EXTCON_CABLE_SLOW_CHARGER,
EXTCON_CABLE_CHARGE_DOWNSTREAM,
EXTCON_CABLE_JIG_USB_ON,
EXTCON_CABLE_JIG_USB_OFF,
EXTCON_CABLE_JIG_UART_OFF,
EXTCON_CABLE_JIG_UART_ON,
_EXTCON_CABLE_NUM,
};
static const char *max14577_extcon_cable[] = {
[EXTCON_CABLE_USB] = "USB",
[EXTCON_CABLE_TA] = "TA",
[EXTCON_CABLE_FAST_CHARGER] = "Fast-charger",
[EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
[EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
[EXTCON_CABLE_JIG_USB_ON] = "JIG-USB-ON",
[EXTCON_CABLE_JIG_USB_OFF] = "JIG-USB-OFF",
[EXTCON_CABLE_JIG_UART_OFF] = "JIG-UART-OFF",
[EXTCON_CABLE_JIG_UART_ON] = "JIG-UART-ON",
NULL,
};
/*
* max14577_muic_set_debounce_time - Set the debounce time of ADC
* @info: the instance including private data of max14577 MUIC
* @time: the debounce time of ADC
*/
static int max14577_muic_set_debounce_time(struct max14577_muic_info *info,
enum max14577_muic_adc_debounce_time time)
{
u8 ret;
switch (time) {
case ADC_DEBOUNCE_TIME_5MS:
case ADC_DEBOUNCE_TIME_10MS:
case ADC_DEBOUNCE_TIME_25MS:
case ADC_DEBOUNCE_TIME_38_62MS:
ret = max14577_update_reg(info->max14577->regmap,
MAX14577_MUIC_REG_CONTROL3,
CTRL3_ADCDBSET_MASK,
time << CTRL3_ADCDBSET_SHIFT);
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;
};
/*
* max14577_muic_set_path - Set hardware line according to attached cable
* @info: the instance including private data of max14577 MUIC
* @value: the path according to attached cable
* @attached: the state of cable (true:attached, false:detached)
*
* The max14577 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 max14577_muic_set_path(struct max14577_muic_info *info,
u8 val, bool attached)
{
int ret = 0;
u8 ctrl1, ctrl2 = 0;
/* Set open state to path before changing hw path */
ret = max14577_update_reg(info->max14577->regmap,
MAX14577_MUIC_REG_CONTROL1,
CLEAR_IDBEN_MICEN_MASK, CTRL1_SW_OPEN);
if (ret < 0) {
dev_err(info->dev, "failed to update MUIC register\n");
return ret;
}
if (attached)
ctrl1 = val;
else
ctrl1 = CTRL1_SW_OPEN;
ret = max14577_update_reg(info->max14577->regmap,
MAX14577_MUIC_REG_CONTROL1,
CLEAR_IDBEN_MICEN_MASK, ctrl1);
if (ret < 0) {
dev_err(info->dev, "failed to update MUIC register\n");
return ret;
}
if (attached)
ctrl2 |= CTRL2_CPEN_MASK; /* LowPwr=0, CPEn=1 */
else
ctrl2 |= CTRL2_LOWPWR_MASK; /* LowPwr=1, CPEn=0 */
ret = max14577_update_reg(info->max14577->regmap,
MAX14577_REG_CONTROL2,
CTRL2_LOWPWR_MASK | CTRL2_CPEN_MASK, ctrl2);
if (ret < 0) {
dev_err(info->dev, "failed to update MUIC register\n");
return ret;
}
dev_dbg(info->dev,
"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
ctrl1, ctrl2, attached ? "attached" : "detached");
return 0;
}
/*
* max14577_muic_get_cable_type - Return cable type and check cable state
* @info: the instance including private data of max14577 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.
* - max14577_CABLE_GROUP_ADC
* - max14577_CABLE_GROUP_CHG
*/
static int max14577_muic_get_cable_type(struct max14577_muic_info *info,
enum max14577_muic_cable_group group, bool *attached)
{
int cable_type = 0;
int adc;
int chg_type;
switch (group) {
case MAX14577_CABLE_GROUP_ADC:
/*
* Read ADC value to check cable type and decide cable state
* according to cable type
*/
adc = info->status[MAX14577_MUIC_STATUS1] & 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 == MAX14577_MUIC_ADC_OPEN) {
*attached = false;
cable_type = info->prev_cable_type;
info->prev_cable_type = MAX14577_MUIC_ADC_OPEN;
} else {
*attached = true;
cable_type = info->prev_cable_type = adc;
}
break;
case MAX14577_CABLE_GROUP_CHG:
/*
* Read charger type to check cable type and decide cable state
* according to type of charger cable.
*/
chg_type = info->status[MAX14577_MUIC_STATUS2] &
STATUS2_CHGTYP_MASK;
chg_type >>= STATUS2_CHGTYP_SHIFT;
if (chg_type == MAX14577_CHARGER_TYPE_NONE) {
*attached = false;
cable_type = info->prev_chg_type;
info->prev_chg_type = MAX14577_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 max14577_muic_jig_handler(struct max14577_muic_info *info,
int cable_type, bool attached)
{
char cable_name[32];
int ret = 0;
u8 path = CTRL1_SW_OPEN;
dev_dbg(info->dev,
"external connector is %s (adc:0x%02x)\n",
attached ? "attached" : "detached", cable_type);
switch (cable_type) {
case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF: /* ADC_JIG_USB_OFF */
/* PATH:AP_USB */
strcpy(cable_name, "JIG-USB-OFF");
path = CTRL1_SW_USB;
break;
case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON: /* ADC_JIG_USB_ON */
/* PATH:AP_USB */
strcpy(cable_name, "JIG-USB-ON");
path = CTRL1_SW_USB;
break;
case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF: /* ADC_JIG_UART_OFF */
/* PATH:AP_UART */
strcpy(cable_name, "JIG-UART-OFF");
path = CTRL1_SW_UART;
break;
default:
dev_err(info->dev, "failed to detect %s jig cable\n",
attached ? "attached" : "detached");
return -EINVAL;
}
ret = max14577_muic_set_path(info, path, attached);
if (ret < 0)
return ret;
extcon_set_cable_state(info->edev, cable_name, attached);
return 0;
}
static int max14577_muic_adc_handler(struct max14577_muic_info *info)
{
int cable_type;
bool attached;
int ret = 0;
/* Check accessory state which is either detached or attached */
cable_type = max14577_muic_get_cable_type(info,
MAX14577_CABLE_GROUP_ADC, &attached);
dev_dbg(info->dev,
"external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
attached ? "attached" : "detached", cable_type,
info->prev_cable_type);
switch (cable_type) {
case MAX14577_MUIC_ADC_FACTORY_MODE_USB_OFF:
case MAX14577_MUIC_ADC_FACTORY_MODE_USB_ON:
case MAX14577_MUIC_ADC_FACTORY_MODE_UART_OFF:
/* JIG */
ret = max14577_muic_jig_handler(info, cable_type, attached);
if (ret < 0)
return ret;
break;
case MAX14577_MUIC_ADC_GROUND:
case MAX14577_MUIC_ADC_SEND_END_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S1_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S2_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S3_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S4_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S5_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S6_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S7_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S8_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S9_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S10_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S11_BUTTON:
case MAX14577_MUIC_ADC_REMOTE_S12_BUTTON:
case MAX14577_MUIC_ADC_RESERVED_ACC_1:
case MAX14577_MUIC_ADC_RESERVED_ACC_2:
case MAX14577_MUIC_ADC_RESERVED_ACC_3:
case MAX14577_MUIC_ADC_RESERVED_ACC_4:
case MAX14577_MUIC_ADC_RESERVED_ACC_5:
case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE2:
case MAX14577_MUIC_ADC_PHONE_POWERED_DEV:
case MAX14577_MUIC_ADC_TTY_CONVERTER:
case MAX14577_MUIC_ADC_UART_CABLE:
case MAX14577_MUIC_ADC_CEA936A_TYPE1_CHG:
case MAX14577_MUIC_ADC_AV_CABLE_NOLOAD:
case MAX14577_MUIC_ADC_CEA936A_TYPE2_CHG:
case MAX14577_MUIC_ADC_FACTORY_MODE_UART_ON:
case MAX14577_MUIC_ADC_AUDIO_DEVICE_TYPE1:
/*
* This accessory isn't used in general case if it is specially
* needed to detect additional accessory, should implement
* proper operation when this accessory is attached/detached.
*/
dev_info(info->dev,
"accessory is %s but it isn't used (adc:0x%x)\n",
attached ? "attached" : "detached", cable_type);
return -EAGAIN;
default:
dev_err(info->dev,
"failed to detect %s accessory (adc:0x%x)\n",
attached ? "attached" : "detached", cable_type);
return -EINVAL;
}
return 0;
}
static int max14577_muic_chg_handler(struct max14577_muic_info *info)
{
int chg_type;
bool attached;
int ret = 0;
chg_type = max14577_muic_get_cable_type(info,
MAX14577_CABLE_GROUP_CHG, &attached);
dev_dbg(info->dev,
"external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
attached ? "attached" : "detached",
chg_type, info->prev_chg_type);
switch (chg_type) {
case MAX14577_CHARGER_TYPE_USB:
/* PATH:AP_USB */
ret = max14577_muic_set_path(info, info->path_usb, attached);
if (ret < 0)
return ret;
extcon_set_cable_state(info->edev, "USB", attached);
break;
case MAX14577_CHARGER_TYPE_DEDICATED_CHG:
extcon_set_cable_state(info->edev, "TA", attached);
break;
case MAX14577_CHARGER_TYPE_DOWNSTREAM_PORT:
extcon_set_cable_state(info->edev,
"Charge-downstream", attached);
break;
case MAX14577_CHARGER_TYPE_SPECIAL_500MA:
extcon_set_cable_state(info->edev, "Slow-charger", attached);
break;
case MAX14577_CHARGER_TYPE_SPECIAL_1A:
extcon_set_cable_state(info->edev, "Fast-charger", attached);
break;
case MAX14577_CHARGER_TYPE_NONE:
case MAX14577_CHARGER_TYPE_DEAD_BATTERY:
break;
default:
dev_err(info->dev,
"failed to detect %s accessory (chg_type:0x%x)\n",
attached ? "attached" : "detached", chg_type);
return -EINVAL;
}
return 0;
}
static void max14577_muic_irq_work(struct work_struct *work)
{
struct max14577_muic_info *info = container_of(work,
struct max14577_muic_info, irq_work);
int ret = 0;
if (!info->edev)
return;
mutex_lock(&info->mutex);
ret = max14577_bulk_read(info->max14577->regmap,
MAX14577_MUIC_REG_STATUS1, info->status, 2);
if (ret) {
dev_err(info->dev, "failed to read MUIC register\n");
mutex_unlock(&info->mutex);
return;
}
if (info->irq_adc) {
ret = max14577_muic_adc_handler(info);
info->irq_adc = false;
}
if (info->irq_chg) {
ret = max14577_muic_chg_handler(info);
info->irq_chg = false;
}
if (ret < 0)
dev_err(info->dev, "failed to handle MUIC interrupt\n");
mutex_unlock(&info->mutex);
return;
}
static irqreturn_t max14577_muic_irq_handler(int irq, void *data)
{
struct max14577_muic_info *info = data;
int i, irq_type = -1;
/*
* We may be called multiple times for different nested IRQ-s.
* Including changes in INT1_ADC and INT2_CGHTYP at once.
* However we only need to know whether it was ADC, charger
* or both interrupts so decode IRQ and turn on proper flags.
*/
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++)
if (irq == muic_irqs[i].virq)
irq_type = muic_irqs[i].irq;
switch (irq_type) {
case MAX14577_IRQ_INT1_ADC:
case MAX14577_IRQ_INT1_ADCLOW:
case MAX14577_IRQ_INT1_ADCERR:
/* Handle all of accessory except for
type of charger accessory */
info->irq_adc = true;
break;
case MAX14577_IRQ_INT2_CHGTYP:
case MAX14577_IRQ_INT2_CHGDETRUN:
case MAX14577_IRQ_INT2_DCDTMR:
case MAX14577_IRQ_INT2_DBCHG:
case MAX14577_IRQ_INT2_VBVOLT:
/* Handle charger accessory */
info->irq_chg = true;
break;
default:
dev_err(info->dev, "muic interrupt: irq %d occurred, skipped\n",
irq_type);
return IRQ_HANDLED;
}
schedule_work(&info->irq_work);
return IRQ_HANDLED;
}
static int max14577_muic_detect_accessory(struct max14577_muic_info *info)
{
int ret = 0;
int adc;
int chg_type;
bool attached;
mutex_lock(&info->mutex);
/* Read STATUSx register to detect accessory */
ret = max14577_bulk_read(info->max14577->regmap,
MAX14577_MUIC_REG_STATUS1, info->status, 2);
if (ret) {
dev_err(info->dev, "failed to read MUIC register\n");
mutex_unlock(&info->mutex);
return ret;
}
adc = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_ADC,
&attached);
if (attached && adc != MAX14577_MUIC_ADC_OPEN) {
ret = max14577_muic_adc_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect accessory\n");
mutex_unlock(&info->mutex);
return ret;
}
}
chg_type = max14577_muic_get_cable_type(info, MAX14577_CABLE_GROUP_CHG,
&attached);
if (attached && chg_type != MAX14577_CHARGER_TYPE_NONE) {
ret = max14577_muic_chg_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect charger accessory\n");
mutex_unlock(&info->mutex);
return ret;
}
}
mutex_unlock(&info->mutex);
return 0;
}
static void max14577_muic_detect_cable_wq(struct work_struct *work)
{
struct max14577_muic_info *info = container_of(to_delayed_work(work),
struct max14577_muic_info, wq_detcable);
max14577_muic_detect_accessory(info);
}
static int max14577_muic_probe(struct platform_device *pdev)
{
struct max14577 *max14577 = dev_get_drvdata(pdev->dev.parent);
struct max14577_muic_info *info;
int delay_jiffies;
int ret;
int i;
u8 id;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
info->dev = &pdev->dev;
info->max14577 = max14577;
platform_set_drvdata(pdev, info);
mutex_init(&info->mutex);
INIT_WORK(&info->irq_work, max14577_muic_irq_work);
/* Support irq domain for max14577 MUIC device */
for (i = 0; i < ARRAY_SIZE(muic_irqs); i++) {
struct max14577_muic_irq *muic_irq = &muic_irqs[i];
unsigned int virq = 0;
virq = regmap_irq_get_virq(max14577->irq_data, muic_irq->irq);
if (!virq)
return -EINVAL;
muic_irq->virq = virq;
ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
max14577_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;
}
}
/* Initialize extcon device */
info->edev = devm_kzalloc(&pdev->dev, sizeof(*info->edev), GFP_KERNEL);
if (!info->edev) {
dev_err(&pdev->dev, "failed to allocate memory for extcon\n");
return -ENOMEM;
}
info->edev->name = DEV_NAME;
info->edev->supported_cable = max14577_extcon_cable;
ret = extcon_dev_register(info->edev);
if (ret) {
dev_err(&pdev->dev, "failed to register extcon device\n");
return ret;
}
/* Default h/w line path */
info->path_usb = CTRL1_SW_USB;
info->path_uart = CTRL1_SW_UART;
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
/* Set initial path for UART */
max14577_muic_set_path(info, info->path_uart, true);
/* Check revision number of MUIC device*/
ret = max14577_read_reg(info->max14577->regmap,
MAX14577_REG_DEVICEID, &id);
if (ret < 0) {
dev_err(&pdev->dev, "failed to read revision number\n");
goto err_extcon;
}
dev_info(info->dev, "device ID : 0x%x\n", id);
/* Set ADC debounce time */
max14577_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, max14577_muic_detect_cable_wq);
ret = queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
delay_jiffies);
if (ret < 0) {
dev_err(&pdev->dev,
"failed to schedule delayed work for cable detect\n");
goto err_extcon;
}
return ret;
err_extcon:
extcon_dev_unregister(info->edev);
return ret;
}
static int max14577_muic_remove(struct platform_device *pdev)
{
struct max14577_muic_info *info = platform_get_drvdata(pdev);
cancel_work_sync(&info->irq_work);
extcon_dev_unregister(info->edev);
return 0;
}
static struct platform_driver max14577_muic_driver = {
.driver = {
.name = DEV_NAME,
.owner = THIS_MODULE,
},
.probe = max14577_muic_probe,
.remove = max14577_muic_remove,
};
module_platform_driver(max14577_muic_driver);
MODULE_DESCRIPTION("MAXIM 14577 Extcon driver");
MODULE_AUTHOR("Chanwoo Choi <cw00.choi@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:extcon-max14577");
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