extcon: max77843: Add support for SmartDock accessory

SmartDock uses ADC_RESERVED_ACC_3 (0x10) ADC ID type and provides following
features:
1. USB host with embedded USB hub (2-4 ports) for mice, keyboard, etc,
2. MHL for video output,
3. charging.

Tested with Unitek Y-2165 MHL+OTG Hub Smart Phone Dock.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

1 files changed, 63 insertions, 14 deletions

diff --git a/drivers/extcon/extcon-max77843.c b/drivers/extcon/extcon-max77843.c
index 17d6bd76edb4..c9fcd6cd41cb 100644
--- a/drivers/extcon/extcon-max77843.c
+++ b/drivers/extcon/extcon-max77843.c
@@ -80,7 +80,7 @@ enum max77843_muic_accessory_type {
         MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
         MAX77843_MUIC_ADC_RESERVED_ACC_1,
         MAX77843_MUIC_ADC_RESERVED_ACC_2,
-        MAX77843_MUIC_ADC_RESERVED_ACC_3,
+        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,
@@ -119,6 +119,7 @@ enum max77843_muic_charger_type {
         MAX77843_MUIC_CHG_SPECIAL_BIAS,
         MAX77843_MUIC_CHG_RESERVED,
         MAX77843_MUIC_CHG_GND,
+        MAX77843_MUIC_CHG_DOCK,
 };
 
 static const unsigned int max77843_extcon_cable[] = {
@@ -130,6 +131,7 @@ static const unsigned int max77843_extcon_cable[] = {
         EXTCON_CHG_USB_FAST,
         EXTCON_CHG_USB_SLOW,
         EXTCON_DISP_MHL,
+        EXTCON_DOCK,
         EXTCON_JIG,
         EXTCON_NONE,
 };
@@ -200,7 +202,7 @@ static const struct regmap_irq_chip max77843_muic_irq_chip = {
 };
 
 static int max77843_muic_set_path(struct max77843_muic_info *info,
-                u8 val, bool attached)
+                u8 val, bool attached, bool nobccomp)
 {
         struct max77693_dev *max77843 = info->max77843;
         int ret = 0;
@@ -210,10 +212,16 @@ static int max77843_muic_set_path(struct max77843_muic_info *info,
                 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, ctrl1);
+                        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;
@@ -303,6 +311,19 @@ static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
                         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;
@@ -365,7 +386,7 @@ static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_GND_USB_HOST_VB:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_USB,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -376,7 +397,7 @@ static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_GND_MHL:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -412,7 +433,7 @@ static int max77843_muic_jig_handler(struct max77843_muic_info *info,
                 return -EINVAL;
         }
 
-        ret = max77843_muic_set_path(info, path, attached);
+        ret = max77843_muic_set_path(info, path, attached, false);
         if (ret < 0)
                 return ret;
 
@@ -421,6 +442,26 @@ static int max77843_muic_jig_handler(struct max77843_muic_info *info,
         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;
@@ -435,6 +476,11 @@ static int max77843_muic_adc_handler(struct max77843_muic_info *info)
                 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)
@@ -462,7 +508,6 @@ static int max77843_muic_adc_handler(struct max77843_muic_info *info)
         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_3:
         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
@@ -506,7 +551,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_CHG_USB:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_USB,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -517,7 +562,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_CHG_DOWNSTREAM:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -527,7 +572,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_CHG_DEDICATED:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -537,7 +582,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_CHG_SPECIAL_500MA:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -547,7 +592,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
         case MAX77843_MUIC_CHG_SPECIAL_1A:
                 ret = max77843_muic_set_path(info,
                                              MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                             attached);
+                                             attached, false);
                 if (ret < 0)
                         return ret;
 
@@ -566,6 +611,9 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
                         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:
@@ -574,7 +622,7 @@ static int max77843_muic_chg_handler(struct max77843_muic_info *info)
                         attached ? "attached" : "detached", chg_type);
 
                 max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_OPEN,
-                                       attached);
+                                       attached, false);
                 return -EINVAL;
         }
 
@@ -814,7 +862,8 @@ static int max77843_muic_probe(struct platform_device *pdev)
         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 
         /* Set initial path for UART */
-        max77843_muic_set_path(info, MAX77843_MUIC_CONTROL1_SW_UART, true);
+        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);