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alistair23-linux/drivers/extcon/extcon-max77843.c
Marek Szyprowski d9204acb37 extcon: max77843: Avoid forcing UART path on drive probe 
Driver unconditionally forces UART path during probe, probably to ensure
that one can get kernel serial log as soon as possible.

This approach causes some issues, especially when board is booted with
non-UART cable connected to micro-USB port. For example, when USB cable is
connected, UART TX/RX lines are unconditionally short-circuited to USB
D+/D- lines. This is in turn recognized by a series of serial BREAK
signals and some random characters when USB host tries to perform
enumeration procedure.

To solve the above issue and keep UART console operational as early as
possible, set UART path only when USB ID reports UART capable cable.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
2018-11-12 09:17:13 +09:00

968 lines
26 KiB
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// SPDX-License-Identifier: GPL-2.0+
//
// extcon-max77843.c - Maxim MAX77843 extcon driver to support
// MUIC(Micro USB Interface Controller)
//
// Copyright (C) 2015 Samsung Electronics
// Author: Jaewon Kim <jaewon02.kim@samsung.com>
#include <linux/extcon-provider.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mfd/max77693-common.h>
#include <linux/mfd/max77843-private.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/workqueue.h>
#define DELAY_MS_DEFAULT 15000 /* unit: millisecond */
enum max77843_muic_status {
MAX77843_MUIC_STATUS1 = 0,
MAX77843_MUIC_STATUS2,
MAX77843_MUIC_STATUS3,
MAX77843_MUIC_STATUS_NUM,
};
struct max77843_muic_info {
struct device *dev;
struct max77693_dev *max77843;
struct extcon_dev *edev;
struct mutex mutex;
struct work_struct irq_work;
struct delayed_work wq_detcable;
u8 status[MAX77843_MUIC_STATUS_NUM];
int prev_cable_type;
int prev_chg_type;
int prev_gnd_type;
bool irq_adc;
bool irq_chg;
};
enum max77843_muic_cable_group {
MAX77843_CABLE_GROUP_ADC = 0,
MAX77843_CABLE_GROUP_ADC_GND,
MAX77843_CABLE_GROUP_CHG,
};
enum max77843_muic_adc_debounce_time {
MAX77843_DEBOUNCE_TIME_5MS = 0,
MAX77843_DEBOUNCE_TIME_10MS,
MAX77843_DEBOUNCE_TIME_25MS,
MAX77843_DEBOUNCE_TIME_38_62MS,
};
/* Define accessory cable type */
enum max77843_muic_accessory_type {
MAX77843_MUIC_ADC_GROUND = 0,
MAX77843_MUIC_ADC_SEND_END_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
MAX77843_MUIC_ADC_RESERVED_ACC_1,
MAX77843_MUIC_ADC_RESERVED_ACC_2,
MAX77843_MUIC_ADC_RESERVED_ACC_3, /* SmartDock */
MAX77843_MUIC_ADC_RESERVED_ACC_4,
MAX77843_MUIC_ADC_RESERVED_ACC_5,
MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
MAX77843_MUIC_ADC_TTY_CONVERTER,
MAX77843_MUIC_ADC_UART_CABLE,
MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
MAX77843_MUIC_ADC_OPEN,
/*
* The below accessories should check
* not only ADC value but also ADC1K and VBVolt value.
*/
/* Offset|ADC1K|VBVolt| */
MAX77843_MUIC_GND_USB_HOST = 0x100, /* 0x1| 0| 0| */
MAX77843_MUIC_GND_USB_HOST_VB = 0x101, /* 0x1| 0| 1| */
MAX77843_MUIC_GND_MHL = 0x102, /* 0x1| 1| 0| */
MAX77843_MUIC_GND_MHL_VB = 0x103, /* 0x1| 1| 1| */
};
/* Define charger cable type */
enum max77843_muic_charger_type {
MAX77843_MUIC_CHG_NONE = 0,
MAX77843_MUIC_CHG_USB,
MAX77843_MUIC_CHG_DOWNSTREAM,
MAX77843_MUIC_CHG_DEDICATED,
MAX77843_MUIC_CHG_SPECIAL_500MA,
MAX77843_MUIC_CHG_SPECIAL_1A,
MAX77843_MUIC_CHG_SPECIAL_BIAS,
MAX77843_MUIC_CHG_RESERVED,
MAX77843_MUIC_CHG_GND,
MAX77843_MUIC_CHG_DOCK,
};
static const unsigned int max77843_extcon_cable[] = {
EXTCON_USB,
EXTCON_USB_HOST,
EXTCON_CHG_USB_SDP,
EXTCON_CHG_USB_DCP,
EXTCON_CHG_USB_CDP,
EXTCON_CHG_USB_FAST,
EXTCON_CHG_USB_SLOW,
EXTCON_DISP_MHL,
EXTCON_DOCK,
EXTCON_JIG,
EXTCON_NONE,
};
struct max77843_muic_irq {
unsigned int irq;
const char *name;
unsigned int virq;
};
static struct max77843_muic_irq max77843_muic_irqs[] = {
{ MAX77843_MUIC_IRQ_INT1_ADC, "MUIC-ADC" },
{ MAX77843_MUIC_IRQ_INT1_ADCERROR, "MUIC-ADC_ERROR" },
{ MAX77843_MUIC_IRQ_INT1_ADC1K, "MUIC-ADC1K" },
{ MAX77843_MUIC_IRQ_INT2_CHGTYP, "MUIC-CHGTYP" },
{ MAX77843_MUIC_IRQ_INT2_CHGDETRUN, "MUIC-CHGDETRUN" },
{ MAX77843_MUIC_IRQ_INT2_DCDTMR, "MUIC-DCDTMR" },
{ MAX77843_MUIC_IRQ_INT2_DXOVP, "MUIC-DXOVP" },
{ MAX77843_MUIC_IRQ_INT2_VBVOLT, "MUIC-VBVOLT" },
{ MAX77843_MUIC_IRQ_INT3_VBADC, "MUIC-VBADC" },
{ MAX77843_MUIC_IRQ_INT3_VDNMON, "MUIC-VDNMON" },
{ MAX77843_MUIC_IRQ_INT3_DNRES, "MUIC-DNRES" },
{ MAX77843_MUIC_IRQ_INT3_MPNACK, "MUIC-MPNACK"},
{ MAX77843_MUIC_IRQ_INT3_MRXBUFOW, "MUIC-MRXBUFOW"},
{ MAX77843_MUIC_IRQ_INT3_MRXTRF, "MUIC-MRXTRF"},
{ MAX77843_MUIC_IRQ_INT3_MRXPERR, "MUIC-MRXPERR"},
{ MAX77843_MUIC_IRQ_INT3_MRXRDY, "MUIC-MRXRDY"},
};
static const struct regmap_config max77843_muic_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = MAX77843_MUIC_REG_END,
};
static const struct regmap_irq max77843_muic_irq[] = {
/* INT1 interrupt */
{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
{ .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
{ .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
/* INT2 interrupt */
{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
{ .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
{ .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
{ .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
{ .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
/* INT3 interrupt */
{ .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
{ .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
};
static const struct regmap_irq_chip max77843_muic_irq_chip = {
.name = "max77843-muic",
.status_base = MAX77843_MUIC_REG_INT1,
.mask_base = MAX77843_MUIC_REG_INTMASK1,
.mask_invert = true,
.num_regs = 3,
.irqs = max77843_muic_irq,
.num_irqs = ARRAY_SIZE(max77843_muic_irq),
};
static int max77843_muic_set_path(struct max77843_muic_info *info,
u8 val, bool attached, bool nobccomp)
{
struct max77693_dev *max77843 = info->max77843;
int ret = 0;
unsigned int ctrl1, ctrl2;
if (attached)
ctrl1 = val;
else
ctrl1 = MAX77843_MUIC_CONTROL1_SW_OPEN;
if (nobccomp) {
/* Disable BC1.2 protocol and force manual switch control */
ctrl1 |= MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK;
}
ret = regmap_update_bits(max77843->regmap_muic,
MAX77843_MUIC_REG_CONTROL1,
MAX77843_MUIC_CONTROL1_COM_SW |
MAX77843_MUIC_CONTROL1_NOBCCOMP_MASK,
ctrl1);
if (ret < 0) {
dev_err(info->dev, "Cannot switch MUIC port\n");
return ret;
}
if (attached)
ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
else
ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
ret = regmap_update_bits(max77843->regmap_muic,
MAX77843_MUIC_REG_CONTROL2,
MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
if (ret < 0) {
dev_err(info->dev, "Cannot update lowpower mode\n");
return ret;
}
dev_dbg(info->dev,
"CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
ctrl1, ctrl2, attached ? "attached" : "detached");
return 0;
}
static void max77843_charger_set_otg_vbus(struct max77843_muic_info *info,
bool on)
{
struct max77693_dev *max77843 = info->max77843;
unsigned int cnfg00;
if (on)
cnfg00 = MAX77843_CHG_OTG_MASK | MAX77843_CHG_BOOST_MASK;
else
cnfg00 = MAX77843_CHG_ENABLE | MAX77843_CHG_BUCK_MASK;
regmap_update_bits(max77843->regmap_chg, MAX77843_CHG_REG_CHG_CNFG_00,
MAX77843_CHG_MODE_MASK, cnfg00);
}
static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
enum max77843_muic_cable_group group, bool *attached)
{
int adc, chg_type, cable_type, gnd_type;
adc = info->status[MAX77843_MUIC_STATUS1] &
MAX77843_MUIC_STATUS1_ADC_MASK;
adc >>= MAX77843_MUIC_STATUS1_ADC_SHIFT;
switch (group) {
case MAX77843_CABLE_GROUP_ADC:
if (adc == MAX77843_MUIC_ADC_OPEN) {
*attached = false;
cable_type = info->prev_cable_type;
info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
} else {
*attached = true;
cable_type = info->prev_cable_type = adc;
}
break;
case MAX77843_CABLE_GROUP_CHG:
chg_type = info->status[MAX77843_MUIC_STATUS2] &
MAX77843_MUIC_STATUS2_CHGTYP_MASK;
/* Check GROUND accessory with charger cable */
if (adc == MAX77843_MUIC_ADC_GROUND) {
if (chg_type == MAX77843_MUIC_CHG_NONE) {
/*
* The following state when charger cable is
* disconnected but the GROUND accessory still
* connected.
*/
*attached = false;
cable_type = info->prev_chg_type;
info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
} else {
/*
* The following state when charger cable is
* connected on the GROUND accessory.
*/
*attached = true;
cable_type = MAX77843_MUIC_CHG_GND;
info->prev_chg_type = MAX77843_MUIC_CHG_GND;
}
break;
}
if (adc == MAX77843_MUIC_ADC_RESERVED_ACC_3) { /* SmartDock */
if (chg_type == MAX77843_MUIC_CHG_NONE) {
*attached = false;
cable_type = info->prev_chg_type;
info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
} else {
*attached = true;
cable_type = MAX77843_MUIC_CHG_DOCK;
info->prev_chg_type = MAX77843_MUIC_CHG_DOCK;
}
break;
}
if (chg_type == MAX77843_MUIC_CHG_NONE) {
*attached = false;
cable_type = info->prev_chg_type;
info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
} else {
*attached = true;
cable_type = info->prev_chg_type = chg_type;
}
break;
case MAX77843_CABLE_GROUP_ADC_GND:
if (adc == MAX77843_MUIC_ADC_OPEN) {
*attached = false;
cable_type = info->prev_gnd_type;
info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
} else {
*attached = true;
/*
* Offset|ADC1K|VBVolt|
* 0x1| 0| 0| USB-HOST
* 0x1| 0| 1| USB-HOST with VB
* 0x1| 1| 0| MHL
* 0x1| 1| 1| MHL with VB
*/
/* Get ADC1K register bit */
gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
MAX77843_MUIC_STATUS1_ADC1K_MASK);
/* Get VBVolt register bit */
gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
MAX77843_MUIC_STATUS2_VBVOLT_MASK);
gnd_type >>= MAX77843_MUIC_STATUS2_VBVOLT_SHIFT;
/* Offset of GND cable */
gnd_type |= MAX77843_MUIC_GND_USB_HOST;
cable_type = info->prev_gnd_type = gnd_type;
}
break;
default:
dev_err(info->dev, "Unknown cable group (%d)\n", group);
cable_type = -EINVAL;
break;
}
return cable_type;
}
static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
{
int ret, gnd_cable_type;
bool attached;
gnd_cable_type = max77843_muic_get_cable_type(info,
MAX77843_CABLE_GROUP_ADC_GND, &attached);
dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
attached ? "attached" : "detached", gnd_cable_type);
switch (gnd_cable_type) {
case MAX77843_MUIC_GND_USB_HOST:
case MAX77843_MUIC_GND_USB_HOST_VB:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_USB,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
max77843_charger_set_otg_vbus(info, attached);
break;
case MAX77843_MUIC_GND_MHL_VB:
case MAX77843_MUIC_GND_MHL:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
break;
default:
dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
attached ? "attached" : "detached", gnd_cable_type);
return -EINVAL;
}
return 0;
}
static int max77843_muic_jig_handler(struct max77843_muic_info *info,
int cable_type, bool attached)
{
int ret;
u8 path = MAX77843_MUIC_CONTROL1_SW_OPEN;
dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
attached ? "attached" : "detached", cable_type);
switch (cable_type) {
case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
path = MAX77843_MUIC_CONTROL1_SW_USB;
break;
case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
path = MAX77843_MUIC_CONTROL1_SW_UART;
break;
default:
return -EINVAL;
}
ret = max77843_muic_set_path(info, path, attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_JIG, attached);
return 0;
}
static int max77843_muic_dock_handler(struct max77843_muic_info *info,
bool attached)
{
int ret;
dev_dbg(info->dev, "external connector is %s (adc: 0x10)\n",
attached ? "attached" : "detached");
ret = max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_USB,
attached, attached);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_DISP_MHL, attached);
extcon_set_state_sync(info->edev, EXTCON_USB_HOST, attached);
extcon_set_state_sync(info->edev, EXTCON_DOCK, attached);
return 0;
}
static int max77843_muic_adc_handler(struct max77843_muic_info *info)
{
int ret, cable_type;
bool attached;
cable_type = max77843_muic_get_cable_type(info,
MAX77843_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 MAX77843_MUIC_ADC_RESERVED_ACC_3: /* SmartDock */
ret = max77843_muic_dock_handler(info, attached);
if (ret < 0)
return ret;
break;
case MAX77843_MUIC_ADC_GROUND:
ret = max77843_muic_adc_gnd_handler(info);
if (ret < 0)
return ret;
break;
case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
ret = max77843_muic_jig_handler(info, cable_type, attached);
if (ret < 0)
return ret;
break;
case MAX77843_MUIC_ADC_SEND_END_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
case MAX77843_MUIC_ADC_RESERVED_ACC_1:
case MAX77843_MUIC_ADC_RESERVED_ACC_2:
case MAX77843_MUIC_ADC_RESERVED_ACC_4:
case MAX77843_MUIC_ADC_RESERVED_ACC_5:
case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
case MAX77843_MUIC_ADC_TTY_CONVERTER:
case MAX77843_MUIC_ADC_UART_CABLE:
case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
case MAX77843_MUIC_ADC_OPEN:
dev_err(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 max77843_muic_chg_handler(struct max77843_muic_info *info)
{
int ret, chg_type, gnd_type;
bool attached;
chg_type = max77843_muic_get_cable_type(info,
MAX77843_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 MAX77843_MUIC_CHG_USB:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_USB,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_USB, attached);
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SDP,
attached);
break;
case MAX77843_MUIC_CHG_DOWNSTREAM:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_CDP,
attached);
break;
case MAX77843_MUIC_CHG_DEDICATED:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
attached);
break;
case MAX77843_MUIC_CHG_SPECIAL_500MA:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_SLOW,
attached);
break;
case MAX77843_MUIC_CHG_SPECIAL_1A:
ret = max77843_muic_set_path(info,
MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
if (ret < 0)
return ret;
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_FAST,
attached);
break;
case MAX77843_MUIC_CHG_GND:
gnd_type = max77843_muic_get_cable_type(info,
MAX77843_CABLE_GROUP_ADC_GND, &attached);
/* Charger cable on MHL accessory is attach or detach */
if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
true);
else if (gnd_type == MAX77843_MUIC_GND_MHL)
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP,
false);
break;
case MAX77843_MUIC_CHG_DOCK:
extcon_set_state_sync(info->edev, EXTCON_CHG_USB_DCP, attached);
break;
case MAX77843_MUIC_CHG_NONE:
break;
default:
dev_err(info->dev,
"failed to detect %s accessory (chg_type:0x%x)\n",
attached ? "attached" : "detached", chg_type);
max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
attached, false);
return -EINVAL;
}
return 0;
}
static void max77843_muic_irq_work(struct work_struct *work)
{
struct max77843_muic_info *info = container_of(work,
struct max77843_muic_info, irq_work);
struct max77693_dev *max77843 = info->max77843;
int ret = 0;
mutex_lock(&info->mutex);
ret = regmap_bulk_read(max77843->regmap_muic,
MAX77843_MUIC_REG_STATUS1, info->status,
MAX77843_MUIC_STATUS_NUM);
if (ret) {
dev_err(info->dev, "Cannot read STATUS registers\n");
mutex_unlock(&info->mutex);
return;
}
if (info->irq_adc) {
ret = max77843_muic_adc_handler(info);
if (ret)
dev_err(info->dev, "Unknown cable type\n");
info->irq_adc = false;
}
if (info->irq_chg) {
ret = max77843_muic_chg_handler(info);
if (ret)
dev_err(info->dev, "Unknown charger type\n");
info->irq_chg = false;
}
mutex_unlock(&info->mutex);
}
static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
{
struct max77843_muic_info *info = data;
int i, irq_type = -1;
for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
if (irq == max77843_muic_irqs[i].virq)
irq_type = max77843_muic_irqs[i].irq;
switch (irq_type) {
case MAX77843_MUIC_IRQ_INT1_ADC:
case MAX77843_MUIC_IRQ_INT1_ADCERROR:
case MAX77843_MUIC_IRQ_INT1_ADC1K:
info->irq_adc = true;
break;
case MAX77843_MUIC_IRQ_INT2_CHGTYP:
case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
case MAX77843_MUIC_IRQ_INT2_DCDTMR:
case MAX77843_MUIC_IRQ_INT2_DXOVP:
case MAX77843_MUIC_IRQ_INT2_VBVOLT:
info->irq_chg = true;
break;
case MAX77843_MUIC_IRQ_INT3_VBADC:
case MAX77843_MUIC_IRQ_INT3_VDNMON:
case MAX77843_MUIC_IRQ_INT3_DNRES:
case MAX77843_MUIC_IRQ_INT3_MPNACK:
case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
case MAX77843_MUIC_IRQ_INT3_MRXTRF:
case MAX77843_MUIC_IRQ_INT3_MRXPERR:
case MAX77843_MUIC_IRQ_INT3_MRXRDY:
break;
default:
dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
break;
}
schedule_work(&info->irq_work);
return IRQ_HANDLED;
}
static void max77843_muic_detect_cable_wq(struct work_struct *work)
{
struct max77843_muic_info *info = container_of(to_delayed_work(work),
struct max77843_muic_info, wq_detcable);
struct max77693_dev *max77843 = info->max77843;
int chg_type, adc, ret;
bool attached;
mutex_lock(&info->mutex);
ret = regmap_bulk_read(max77843->regmap_muic,
MAX77843_MUIC_REG_STATUS1, info->status,
MAX77843_MUIC_STATUS_NUM);
if (ret) {
dev_err(info->dev, "Cannot read STATUS registers\n");
goto err_cable_wq;
}
adc = max77843_muic_get_cable_type(info,
MAX77843_CABLE_GROUP_ADC, &attached);
if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
ret = max77843_muic_adc_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect accessory\n");
goto err_cable_wq;
}
}
chg_type = max77843_muic_get_cable_type(info,
MAX77843_CABLE_GROUP_CHG, &attached);
if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
ret = max77843_muic_chg_handler(info);
if (ret < 0) {
dev_err(info->dev, "Cannot detect charger accessory\n");
goto err_cable_wq;
}
}
err_cable_wq:
mutex_unlock(&info->mutex);
}
static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
enum max77843_muic_adc_debounce_time time)
{
struct max77693_dev *max77843 = info->max77843;
int ret;
switch (time) {
case MAX77843_DEBOUNCE_TIME_5MS:
case MAX77843_DEBOUNCE_TIME_10MS:
case MAX77843_DEBOUNCE_TIME_25MS:
case MAX77843_DEBOUNCE_TIME_38_62MS:
ret = regmap_update_bits(max77843->regmap_muic,
MAX77843_MUIC_REG_CONTROL4,
MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
time << MAX77843_MUIC_CONTROL4_ADCDBSET_SHIFT);
if (ret < 0) {
dev_err(info->dev, "Cannot write MUIC regmap\n");
return ret;
}
break;
default:
dev_err(info->dev, "Invalid ADC debounce time\n");
return -EINVAL;
}
return 0;
}
static int max77843_init_muic_regmap(struct max77693_dev *max77843)
{
int ret;
max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
I2C_ADDR_MUIC);
if (!max77843->i2c_muic) {
dev_err(&max77843->i2c->dev,
"Cannot allocate I2C device for MUIC\n");
return -ENOMEM;
}
i2c_set_clientdata(max77843->i2c_muic, max77843);
max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
&max77843_muic_regmap_config);
if (IS_ERR(max77843->regmap_muic)) {
ret = PTR_ERR(max77843->regmap_muic);
goto err_muic_i2c;
}
ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
if (ret < 0) {
dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
goto err_muic_i2c;
}
return 0;
err_muic_i2c:
i2c_unregister_device(max77843->i2c_muic);
return ret;
}
static int max77843_muic_probe(struct platform_device *pdev)
{
struct max77693_dev *max77843 = dev_get_drvdata(pdev->dev.parent);
struct max77843_muic_info *info;
unsigned int id;
int cable_type;
bool attached;
int i, ret;
info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
info->dev = &pdev->dev;
info->max77843 = max77843;
platform_set_drvdata(pdev, info);
mutex_init(&info->mutex);
/* Initialize i2c and regmap */
ret = max77843_init_muic_regmap(max77843);
if (ret) {
dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
return ret;
}
/* Turn off auto detection configuration */
ret = regmap_update_bits(max77843->regmap_muic,
MAX77843_MUIC_REG_CONTROL4,
MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
CONTROL4_AUTO_DISABLE);
/* Initialize extcon device */
info->edev = devm_extcon_dev_allocate(&pdev->dev,
max77843_extcon_cable);
if (IS_ERR(info->edev)) {
dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
ret = -ENODEV;
goto err_muic_irq;
}
ret = devm_extcon_dev_register(&pdev->dev, info->edev);
if (ret) {
dev_err(&pdev->dev, "Failed to register extcon device\n");
goto err_muic_irq;
}
/* Set ADC debounce time */
max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
/* Set initial path for UART when JIG is connected to get serial logs */
ret = regmap_bulk_read(max77843->regmap_muic,
MAX77843_MUIC_REG_STATUS1, info->status,
MAX77843_MUIC_STATUS_NUM);
if (ret) {
dev_err(info->dev, "Cannot read STATUS registers\n");
goto err_muic_irq;
}
cable_type = max77843_muic_get_cable_type(info, MAX77843_CABLE_GROUP_ADC,
&attached);
if (attached && cable_type == MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF)
max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART,
true, false);
/* Check revision number of MUIC device */
ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
if (ret < 0) {
dev_err(&pdev->dev, "Failed to read revision number\n");
goto err_muic_irq;
}
dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
/* Support virtual irq domain for max77843 MUIC device */
INIT_WORK(&info->irq_work, max77843_muic_irq_work);
/* Clear IRQ bits before request IRQs */
ret = regmap_bulk_read(max77843->regmap_muic,
MAX77843_MUIC_REG_INT1, info->status,
MAX77843_MUIC_STATUS_NUM);
if (ret) {
dev_err(&pdev->dev, "Failed to Clear IRQ bits\n");
goto err_muic_irq;
}
for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
int virq = 0;
virq = regmap_irq_get_virq(max77843->irq_data_muic,
muic_irq->irq);
if (virq <= 0) {
ret = -EINVAL;
goto err_muic_irq;
}
muic_irq->virq = virq;
ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
max77843_muic_irq_handler, IRQF_NO_SUSPEND,
muic_irq->name, info);
if (ret) {
dev_err(&pdev->dev,
"Failed to request irq (IRQ: %d, error: %d)\n",
muic_irq->irq, ret);
goto err_muic_irq;
}
}
/* Detect accessory after completing the initialization of platform */
INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
queue_delayed_work(system_power_efficient_wq,
&info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
return 0;
err_muic_irq:
regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
i2c_unregister_device(max77843->i2c_muic);
return ret;
}
static int max77843_muic_remove(struct platform_device *pdev)
{
struct max77843_muic_info *info = platform_get_drvdata(pdev);
struct max77693_dev *max77843 = info->max77843;
cancel_work_sync(&info->irq_work);
regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
i2c_unregister_device(max77843->i2c_muic);
return 0;
}
static const struct platform_device_id max77843_muic_id[] = {
{ "max77843-muic", },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(platform, max77843_muic_id);
static struct platform_driver max77843_muic_driver = {
.driver = {
.name = "max77843-muic",
},
.probe = max77843_muic_probe,
.remove = max77843_muic_remove,
.id_table = max77843_muic_id,
};
static int __init max77843_muic_init(void)
{
return platform_driver_register(&max77843_muic_driver);
}
subsys_initcall(max77843_muic_init);
MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
MODULE_LICENSE("GPL");
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