extcon: max77693: Add support MHL_TA cable for charging battery

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>

1 files changed, 45 insertions, 11 deletions

diff --git a/drivers/extcon/extcon-max77693.c b/drivers/extcon/extcon-max77693.c
index e84d5dc06798..78dc7505b965 100644
--- a/drivers/extcon/extcon-max77693.c
+++ b/drivers/extcon/extcon-max77693.c
@@ -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) */
@@ -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,
@@ -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",
@@ -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
@@ -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:
@@ -528,7 +535,9 @@ out:
 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,
@@ -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,