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extcon: max77693: Add support MHL_TA cable for charging battery
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This patch support MHL_TA cable for charging battery. The MHL_TA
cable include MHL with TA cable or MHL with micro USB cable. When
MHL with TA/USB cable is attached, extcon-max77693 driver detect
two interrupt for handling precise operation according to each cable
(MHL and TA/USB cable).

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
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Chanwoo Choi committed Jan 15, 2013
1 parent 154f757 commit 06bed0a
Showing 1 changed file with 45 additions and 11 deletions.
56 changes: 45 additions & 11 deletions drivers/extcon/extcon-max77693.c
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Original file line number Diff line number Diff line change
Expand Up @@ -136,9 +136,11 @@ enum max77693_muic_acc_type {

/* The below accessories have same ADC value so ADCLow and
ADC1K bit is used to separate specific accessory */
MAX77693_MUIC_GND_USB_OTG = 0x100, /* ADC:0x0, ADCLow:0, ADC1K:0 */
MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* ADC:0x0, ADCLow:1, ADC1K:0 */
MAX77693_MUIC_GND_MHL_CABLE = 0x103, /* ADC:0x0, ADCLow:1, ADC1K:1 */
MAX77693_MUIC_GND_USB_OTG = 0x100, /* ADC:0x0, VBVolot:0, ADCLow:0, ADC1K:0 */
MAX77693_MUIC_GND_USB_OTG_VB = 0x104, /* ADC:0x0, VBVolot:1, ADCLow:0, ADC1K:0 */
MAX77693_MUIC_GND_AV_CABLE_LOAD = 0x102,/* ADC:0x0, VBVolot:0, ADCLow:1, ADC1K:0 */
MAX77693_MUIC_GND_MHL = 0x103, /* ADC:0x0, VBVolot:0, ADCLow:1, ADC1K:1 */
MAX77693_MUIC_GND_MHL_VB = 0x107, /* ADC:0x0, VBVolot:1, ADCLow:1, ADC1K:1 */
};

/* MAX77693 MUIC device support below list of accessories(external connector) */
Expand All @@ -150,6 +152,7 @@ enum {
EXTCON_CABLE_SLOW_CHARGER,
EXTCON_CABLE_CHARGE_DOWNSTREAM,
EXTCON_CABLE_MHL,
EXTCON_CABLE_MHL_TA,
EXTCON_CABLE_AUDIO_VIDEO_LOAD,
EXTCON_CABLE_AUDIO_VIDEO_NOLOAD,
EXTCON_CABLE_JIG,
Expand All @@ -165,6 +168,7 @@ const char *max77693_extcon_cable[] = {
[EXTCON_CABLE_SLOW_CHARGER] = "Slow-charger",
[EXTCON_CABLE_CHARGE_DOWNSTREAM] = "Charge-downstream",
[EXTCON_CABLE_MHL] = "MHL",
[EXTCON_CABLE_MHL_TA] = "MHL_TA",
[EXTCON_CABLE_AUDIO_VIDEO_LOAD] = "Audio-video-load",
[EXTCON_CABLE_AUDIO_VIDEO_NOLOAD] = "Audio-video-noload",
[EXTCON_CABLE_JIG] = "JIG",
Expand Down Expand Up @@ -330,6 +334,7 @@ static int max77693_muic_get_cable_type(struct max77693_muic_info *info,
/**
* [0x1][VBVolt][ADCLow][ADC1K]
* [0x1 0 0 0 ] : USB_OTG
* [0x1 1 0 0 ] : USB_OTG_VB
* [0x1 0 1 0 ] : Audio Video Cable with load
* [0x1 0 1 1 ] : MHL without charging connector
* [0x1 1 1 1 ] : MHL with charging connector
Expand Down Expand Up @@ -414,22 +419,24 @@ static int max77693_muic_adc_ground_handler(struct max77693_muic_info *info)

switch (cable_type_gnd) {
case MAX77693_MUIC_GND_USB_OTG:
/* USB_OTG */
case MAX77693_MUIC_GND_USB_OTG_VB:
/* USB_OTG, PATH: AP_USB */
ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
if (ret < 0)
goto out;
extcon_set_cable_state(info->edev, "USB-Host", attached);
break;
case MAX77693_MUIC_GND_AV_CABLE_LOAD:
/* Audio Video Cable with load */
/* Audio Video Cable with load, PATH:AUDIO */
ret = max77693_muic_set_path(info, CONTROL1_SW_AUDIO, attached);
if (ret < 0)
goto out;
extcon_set_cable_state(info->edev,
"Audio-video-load", attached);
break;
case MAX77693_MUIC_GND_MHL_CABLE:
/* MHL */
case MAX77693_MUIC_GND_MHL:
case MAX77693_MUIC_GND_MHL_VB:
/* MHL or MHL with USB/TA cable */
extcon_set_cable_state(info->edev, "MHL", attached);
break;
default:
Expand Down Expand Up @@ -528,7 +535,9 @@ static int max77693_muic_adc_handler(struct max77693_muic_info *info)
static int max77693_muic_chg_handler(struct max77693_muic_info *info)
{
int chg_type;
int cable_type_gnd;
bool attached;
bool cable_attached;
int ret = 0;

chg_type = max77693_muic_get_cable_type(info,
Expand All @@ -541,10 +550,35 @@ static int max77693_muic_chg_handler(struct max77693_muic_info *info)

switch (chg_type) {
case MAX77693_CHARGER_TYPE_USB:
ret = max77693_muic_set_path(info, CONTROL1_SW_USB, attached);
if (ret < 0)
goto out;
extcon_set_cable_state(info->edev, "USB", attached);
cable_type_gnd = max77693_muic_get_cable_type(info,
MAX77693_CABLE_GROUP_ADC_GND,
&cable_attached);

switch (cable_type_gnd) {
case MAX77693_MUIC_GND_MHL:
case MAX77693_MUIC_GND_MHL_VB:
/*
* USB/TA with MHL cable
* - MHL cable, which connect micro USB or TA cable,
* is used to charging battery. So, extcon driver check
* charging type whether micro USB or TA cable is
* connected to MHL cable when extcon driver detect MHL
* cable.
*/
extcon_set_cable_state(info->edev, "MHL_TA", attached);

if (!cable_attached)
extcon_set_cable_state(info->edev,
"MHL", false);
break;
default:
/* Only USB cable, PATH:AP_USB */
ret = max77693_muic_set_path(info, CONTROL1_SW_USB,
attached);
if (ret < 0)
goto out;
extcon_set_cable_state(info->edev, "USB", attached);
}
break;
case MAX77693_CHARGER_TYPE_DOWNSTREAM_PORT:
extcon_set_cable_state(info->edev,
Expand Down

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